For my own collection, I kept Gorilla Grodd, Solomon Grundy, 4/5 of Despero, 3/5 of Metallo, 6/7 of Atom Smasher, Giganta, 3/6 of Chemo, Imperiex, 6/7 of Kilowog, Darkseid, Trigon, Anti-Monitor, Apache Chief, S.T.R.I.P.E., & Arkillo.

I really want a Metamorpho.

Really not all that interested in Kalibak, Ultra Humanite, Validus, Bane, Nekron, Brimstone, or Stel. If I happen to finish them from spare parts, that's fine but I doubt I'll ever go hunting for them.

I really like the Imperiex CnC. Giganta is probably my favorite. If I ever finish Chemo, he might take the #1 spot. I don't care all that much for the character, but the plastic fluid effect they did on that figure looks awesome when it all comes together.

Chemo is pretty sweet. I also want Metamorpho but I passed on him a few times and regret it every time. Seems that money just isn't there when I do find a fair price for the bugger.

Well Stel and STRIPE are different in some minor ways.

Differences:
STRIPE: Smoother, larger feet, Less Mobile Hands, Fatter Wrists, Colors
Stel: More Robotic, Colors

Similarities:
Connectors: the connectors are the Exact Same

Reasons:
Using the same Base molds will save money in the long Run for Mattel Most C&C's use different.

I have Imperiex, Kilowog, Trigon, Darkseid, Validus, Bane, Anti-Monitor, and Apache Chief DCUC and Arkillo and Stel of the DCUCGLC. and am working on Gorilla Grodd, Kalibak, Atom Smasher, Giganta, Chemo, Ultra-Humanite, and STRIPE most of these are 1 part except Humanite and STRIPE which require 2 peices each (left Arm and Leg and Head and Lower Torso Respectivly)