Beast Wars:

(Can I list only 10 :P)

Original Basic Airazor
Original Deluxe Cybershark

Transmetals Deluxe Airazor
Transmetals Mega Optimus Primal
Transmetals Mega Megatron
Transmetals Ultra Rampage
Transmetals Ultra Depth Charge

Fuzors Basic Quickstrike

Transmetal 2 Blackarachnia

I can't pick a 10th figure, there are just so many great ones!