That is tough question. I think either Masterpiece Powermaster Prime or Masterpiece Megatron. Or... Masterpiece Soundwave. 1/1 scale, with at least 4 tapes (Ravage, Laserbeak, Frenzy and Rumble), maybe six (Ratbat, Buzzsaw). Basically take the original design and size it based on the side of a real cassette. And make it play them too, just for kicks.