My count worked out to be 55.1% (248). I would like to finish off the 84/85 cast which means I need 11 more (Wheeljack, Bluestreak, Smokescreen, Mirage, Grimlock, Snarl, Slag, Swoop, Reflector, Jetfire and Ramjet) so I guess 58% complete would be ideal.

It's no coincidence that most of the ones I need are common KOs which means originals are pricey and the risk of being sent a KO after spending a lot keeps me away.