What you fav transformer?
The original Megatron - not because of what he can transform into (just a crappy pistol) but because of that massive fusion cannon he carries on his arm - it made the coolest sort of WAADOOMPH sound in the cartoons
Skyfire / Jetfire was a decent one also - no idea if you buy him as a toy though, or whether he was only in the cartoons.
My favourite toy was whichever one could transform into the red Lamborghini Countach - might have been called something like Sidewipe? I think there was a yellow one also.