I'm torn on whether I want the first class to be Rogue + the O5 with Storm as a superior replacement for Warren, or drop Iceman too in favor of Gambit.
Introducing Remy at the same time as Rogue gives you more time to develop as a man and in a relationship with Rogue, both of them keeping the audience on their toes as to when they'll work with a Brotherhood-like group.
OTOH, Iceman could be a Latino (Roberto Drake) and double-dip diversity. Normally I'd say go with the more dynamic character over diversity, but with Marvel Mutants it's a matter of verisimilitude.