Banshee is a pillowbiter; I don't ever want to see him in an X Men film again.
My official badass X Team I'd like to see is Cyclops, Jean Grey, Storm, Beast, Nightcrawler, Iceman, Colossus and Gambit. That's a lot of people to get screen time and character development so if need be take out Beast and keep Gambit as a secondary guy with not much screen time outside of action sequences. Maybe throw in Kitty just to have a love interest for Bobby.
If they do happen to go into the future I'd also like to see Forge, Bishop and Cable somehow. As well as Old Man Logan.
I want a lot.