Pretty much anything sci-fi but specifically:
Aliens
Predator
Robocop
Terminator
Star Wars
More Trek
BSG (classic) - need someone to attack with my army of classic Cylons!
Space 1999 (that would be funny)
Highlander
Matrix
Futurama
I know it will never happen but man would I love an Optimus Prime minimate.
Also Austin Powers - If Mustafa comes with broken legs they could call it the variant instead of a defect.
Blues Brothers might be fun.
How about presidential 2-packs. Bush/Gore, Reagan/Carter, Nixon/Kennedy etc.
A couple are jokes but I would buy everything on this list if they made em!