There's a grand total of 4 different Optimus Prime molds in all Classics-themed lines, not counting the Legends, apread acorss Classics, Generations and Reveal the Shield:
Classics Optimus Prime, Voyager:

Classics Optimus Prime, Deluxe:

Generations Cybertronian Optimus Prime:

And finally, Reveal the Shield Optimus Prime, G2 Laser:

The Voyager is long sold out, but is considered the best out there. He's actually shorter than a real Voyager should be, about the height of the current Voyager Optimus Prime. Go figure.
The resident Rewind... well, half of one

- Jelze Bunnycat =:3
Looking for:
- TR Furos (Hardhead's head) and Crashbash (lost him

)
- PotP Punch head
- TR Galvatron right arm (the gun one)
- CW Brake-Neck/UW Wildrider, CW Offroad
- TR Twinferno & Grotusque
- Greenlight, Lancer and PotP Elita-1
- Legacy Core Slug, Sludge & Snarl