Richard,
Recommendation.... I put this list together for you yesterday and sent in a PM, but I don't know if you got it. The ships in the Avery Class are all names I pulled from the Jackill's guide (change as you wish), but the ones in Saladin and Hermes are part of the Starfleet Technical Manual and are consistent over many other sources. The ones listed under the Nelson class are also ones I put in there, but the ones marked FASA are actual ship names identified in the FASA list. The only conjecture on the Nelson class I made was the numbers, but since Nelson was an actual destroyer name in the SFTM, I simply upgraded/retrofitted it to be the Nelson from the FASA designs and added a few of them in between Saladin and Hermes. It's not perfect, but it allows for a few of that other class to be in the same range of numbers, which makes some good sense, especially since FASA didn't have a registry for that design.
You can do what you like, but Tamerlane is already in use, NCC-510. There were no ships in the latter 400's that I could find listed anywhere, so they are ideal for using for Kelvin/Avery class. Ships of the Avery class, in theory, could have been upgraded to Saladin class, and some could have kept that secondary hull like Kelvin did. There is no reason to start overwriting the Saladin ships because of one ship.
Anyhow, I hope you can use this. It will make for less contradictions in an already very contradictory world. Just my two cents. I will be using it.
Ken
NOTES ON NCC REGISTRY:
1) ONSCREEN TAKES FIRST PRECEDENCE, CANON SHIPS MARKED WITH ^ SYMBOL.
2) STARFLEET TECHNICAL MANUAL (FOLLOWS TOS, ADDED CONSTELLATION CLASS TO CORRECT STAR TREK 11 CONTINUITY AND NCC CONFLICTS WITH ST REMASTERED/GREG JEIN LIST)
3) SHIPS OF THE STARFLEET (FOLLOWS SFTM, DOES NOT CONFLICT)
4) JACKILL'S GUIDES (WHERE THEY CONFLICT, I MOVE THE SHIPS TO FILL GAPS, SEE NOTES)
5) STARFLEET BATTLES REGISTRY (WHERE THEY CONFLICT WITH FASA, I LET CLASS SHIPS SUPERCEDE SHIPS OF CLASS OF EITHER SOURCE)
6) FASA (MOST SHIPS WERE NOT NUMBERED, BUT WHERE THEY ARE, AND DO NOT CONFLICT, I USE NUMBERS PROVIDED)
7) FAN FILMS (ONSCREEN SUPERCEDES ON PAPER, BUT IF THE CONFLICT IS SEVERE, JUDGEMENT CALL, OR ALTERNATE UNIVERSE, marked with !)
PERSONAL CONJECTURAL NAMES
NX-01 ENTERPRISE ^
NX-02 COLUMBIA ^
INTREPID CLASS:
NV-01 INTREPID ^
NCC-01-62 INTREPID CLASS (NAMES UNKNOWN)
NCC-63 COCHRANE (fan fiction forum rpg,
www.usstamerlane.com)
NCC-64- NCC-449 (NEED TO RESEARCH OTHER SOURCES)
AVERY CLASS UPGRADED VARIANT
(CONJECTURAL CLASS AND NAMES)
(NOTE: SOME NAMES ARE FROM JACKILL'S SHIPS OF THE FLEET VOLUME1, MOVED FROM THE 500'S DOWN)
NCC-450 AVERY * CLASS SHIP
NCC-451 MARTIN
NCC-452 KENT
NCC-453 LITTORIO
NCC-454 TRENT
NCC-455 TICONDEROGA ** LOST IN THE LINE OF DUTY
NCC-456 GUANNADA
NCC-457 ALLEYNE
NCC-458 DIEKMAN
NCC-459 STRONG
NCC-460 WILKES
NCC-461 HARLEY
NCC-462 BROOKINGS
NCC-463 QUIGLEY
NCC-464 JOYNER
NCC-465 THOMASON
NCC-566 MCWHIRTER
NCC-467 MANLY
NCC-468 HAGGERTY
NCC-469 PACKARD
NCC-470 NIXON
NCC-471 CLAXTON
NCC-472 HUMES
NCC-473 RANCOR
NCC-474 TIPPS
NCC-475 MURREL
NCC-476 DANLEY
NCC-477 REEVES
NCC-478 TREHLOW
NCC-479 LEBLANC
NCC-480 WAYLANDER
NCC-481 LEANING TOWER (Reserved for Captain Alex) !
NCC-482 RUSAK
NCC-483 ESCH
NCC-484 NIETO
NCC-485 FITZGERALD
NCC-486 COLEBAUGH
NCC-487 ROBBINER
NCC-488 MORRISON
NCC-489 LANE
NCC-490 ORR
NCC-491 ARAGORN
NCC-492 NEAL
NCC-493 SAURON
NCC-494 GONDOR
NCC-495 AQUILONIA
NCC-496 CONAN
NCC-497 SUDRIAN (Reserved for Chronitron) !
NCC-498 CAWLEY
NCC-499 GANDALF
UPGRADED TO SALADIN CLASS (STARFLEET TECHNICAL MANUAL)
NCC-500 SALADIN * CLASS SHIP !^ (Reserved for use in Starship Saladin, see
www.starshipsaladin.com) !

NCC-501 JENGHIZ
NCC-502 DARIUS
NCC-503 ALARIC
NCC-504 SARGON
NCC-505 XERXES
NCC-506 POMPEY
NCC-507 KUBLAI
NCC-508 SULEIMAN
NCC-509 ETZEL
NCC-510 TAMERLANE ! (Adventures of the Tamerlane can be found at
www.usstamerlane.com)

NCC-511 ALEXANDER
NCC-512 HANNIBAL
NCC-513 AHRIMAN
NCC-514 KELVIN (AVERY CLASS VARIANT) (SUPERCEDED BY STAR TREK 11) ^
NCC-515 ADAD
NCC-516 HASHISHIYUN
NCC-517 AZRAEL

NCC-518 HAMILCAR
NCC-519 SHAITAN
NCC-520 SIVA * CLASS SHIP
NCC-521 LUCIFER
NCC-522 MOLOCK
NCC-523 HATHOR
NCC-524 ARES
NCC-525 MARS
NCC-526 TYR
NCC-527 JUGURTHA
NCC-528 IBLIS
NCC-529 LOKI
UPGRADED TO COCHISE CLASS (STARFLEET TECHNICAL MANUAL)
NCC-530 COCHISE * CLASS SHIP
NCC-531 ALVA
NCC-532 PONTIAC
NCC-533 NEY
NCC-534 EL CID
NCC-535 GERONIMO
NCC-536 CORTEZ
NCC-537 ALVARADO
NCC-538 DE RUYTER
NCC-539 HEKTOR
NCC-540 LYSANDER
NCC-541 DRAKE
NCC-542 APPOLLYON
NCC-543 SAMSON
NCC-544 PERSEUS
NCC-545 AL MAHDI
NCC-546 NELSON * CLASS SHIP (MODIFIED DESIGN, FIRST OF CLASS)
NCC-547 AJAX
NCC-548 AKBAR
NCC-549 ABU BEKR
NCC-550 IVAN
NCC-551 ACHILLES
NCC-552 THESEUS
NCC-553 SCIPIO
NCC-554 MARTEL
NCC-555 CIMON
NELSON CLASS FAST SCOUT (FASA SHIPYARDS) (NOTE: THIS FILLS GAPS IN THE NCC SET BETWEEN SALADIN AND HERMES. I MOVED THE
JACKILL'S DOWN BECAUSE OF OVERLAP WITH HERMES CLASS, AND TO FILL IN THE AVERY CLASS) (SOME NAMES ARE ORIGINALS I CREATED,
SOME ARE HEROES FROM ENTERPRISE ERA, SOME ARE NODS TO FELLOW FAN FILM PRODUCERS AND WRITERS, SOME ARE NODS TO BATTLESTAR TOS
ACTORS)
NCC-556 KHAN
NCC-557 BENEDICT
NCC-558 GANNET (The last of the Kelvin Variants built, new build, was never Avery Class, slightly modified) (Reserved for G-Man at his request)
NCC-559 PROBERT
NCC-560 TRIMBLE
NCC-561 MERLIN
NCC-562 STERNBACH
NCC-563 GUINNIVERE
NCC-564 MAYWEATHER
NCC-565 QUINN
NCC-566 ARCHER
NCC-567 SATO
NCC-568 WINDOM
NCC-569 ARANSTAR (Reserved for use in Starship Saladin) !

NCC-570 SAGER (SHIP FROM FASA GUIDE)
NCC-571 JOHNSON
NCC-572 SARUMAN
NCC-573 MOISANEN (SHIP FROM FASA GUIDE)
NCC-574 RAHMAN (redesignated from 514, SFTM)
NCC-575 HATCH (Reserved for use in Starship Saladin) !
NCC-576 GREENE
NCC-577 TUCKER (SOURCE JACKILL'S VOL 1)
NCC-578 MEREDITH (Reserved for use in Starship Saladin) !
NCC-579 KNIGHTSHADE
NCC-580 STYLES
NCC-581 KELLEY
NCC-582 DREXLER
NCC-583 BROUGHTON
NCC-584 MANZER (SHIP FROM FASA GUIDE)
HERMES CLASS SCOUT (STARFLEET TECHNICAL MANUAL)
NCC-585 HERMES * CLASS SHIP
NCC-586 ANUBIS
NCC-587 FRANZ JOSEPH
NCC-588 AEOLUS (James T. Kirk once served as second officer of this ship according to the novel "Enemy Unseen" written by V.E. Mitchell.)
NCC-589 DIANA
NCC-590 QUINTILLUS ** DESTROYED IN THE LINE OF DUTY in "The Captaincy" !
NCC-591 BRIDGER
NCC-592 CARSON
NCC-593 BATIDOR
NCC-594 CODY
NCC-595 REVERE ^
NCC-596 SPAKER
NCC-597 BOWIE
NCC-598 SACAJAWEA
NCC-599 TONTI
NCC-600 CROCKETT
NCC-601 MONOCEROS * CLASS SHIP
NCC-602 ARIES
NCC-603 EQUULUS
NCC-604 LUPUS
NCC-605 TAURUS
NCC-606 CAMELOPARDUS
NCC-607 LEO
NCC-608 LYNX
NCC-609 URSA MAJOR
NCC-610 LEPUS
NCC-611 CANIS MAJOR
NCC-612 PEGASUS
NCC-613 VULPECULA
NCC-614 LEO MINOR
NCC-615 CANIS MINOR
NCC-616 URSA MINOR
NCC-617 CYGNUS * CLASS SHIP
NCC-618 APUS
NCC-619 TUCANA
NCC-620 CORVUS
NCC-621 COLUMBIA ^
NCC-622 PAVO
NCC-623 AQUILA
NCC-624 GRUS
NCC-625 PHOENIX
UPDATE:
NCC-630 OBERTH (built as NX-602, designation changed with cancellation of Hermes Class retirement.)
NCC-631 * Proposed
NCC-632 * Proposed
NCC-633 * Proposed
NCC-634 * Proposed
NCC-635 * Proposed
NCC-636 * Proposed
NCC-637 * ProposedNCC-638 Grissom (First ship of class built)
SEE http://www.cygnus-x1.net/links/lcars/sd-oberth.php FOR OBERTH CLASS SHIP PLANS