Classics:
- Voyager Optimus Prime
- Bumblebee
- Mirage
- Rodimus
- "NERF" Megatron
- Starscream (any seeker, but Starscream for sure)
- Astrotrain
Universe:
- Hound
- Inferno
- Ironhide
- Ratchet
- Sideswipe
- Sunstreaker
Generations/RTS:
- Wheeljack
- Jazz
- Tracks
- Grapple
- Warpath
these are my own choices of course