I think the Vehicons on the whole were quite good, with pretty much all of them worth getting.
As for the Maximals, my picks are: Blackarachnia, Snarl, Skydive, Nightviper, Buzzsaw, Beast Changer, N.S. Cheetor & Hammerstrike.
Silverbolts main problem is that he's not supposed to be an eagle...he's a griffin (not the burger making kind).