A classics/Universe Springer that is a triple changer!

Bludgeon
Thunderwing- both of these need decent toys to represent how cool they are in the comics.
A universe Doubledealer (Why didn't Hasbro communicate with IDW and release him instead of Countdown in the Cyb Def Red Alert mould?)
An affordable Nightbeat

The other combiner teams (terrorcons, protectorbots etc) done in the universe/classics line... even if they don't combine.

Pretty much everything else has been covered by everyone else.