Okay, I'll bite...
I'm partial to the OT and will limit my choices to fit in a standard-sized wave. I'll pretend this is the final wave of figures that Hasbro releases...
SA Luke Skywalker (Hoth Outfit, w/interchangeable head to show Wampa damage)
SA Princess Leia (Hoth Outfit w/gas-mask & interchangeable head for Bespin)
*New* R2-D2 with Launching Lightsaber (with spring-loaded action that's life-threatening)
SA Han Solo (Bespin Outfit, w/gas-mask, MF tools, & hand-cuffs)
SA Luke Skywalker (Stormtrooper Disguise w/Dianoga)
SA ROTJ Emperor Palpatine (w/soft-goods and Throne)
Hyper-SA Rebel Soldier (Hoth Outfit w/brown vest); release 3 versions w/alternate heads
Hyper-SA Emperor's Royal Guard (w/removable helmet, soft-goods and Force Pike)
...and finally, just to screw with us...
SA Yak-Face (available only in Canada and overseas markets)
After looking at my list, I agree it's too heavy on the heroes; there's not enough balance of good-guys, bad-guys, and weird aliens/robots. But this is my dream wave.