I know that this is an old thread but i was interested in what the rest of you guys do.
I normally do X-Men vs 'Brotherhood'
X-Men consisting of Cyclops, Wolvie, Storm, Colossus, Kitty, Beast and Jean all in Yellow and Black
costumes.
My 'Brotherhood' is Magneto, Mystique, Juggernaut, then weirdly Spider-Carnage and Green Goblin plus glider because these are pretty much the only villians I have.
I also like doing Fantastic Four vs Doom and Silver Surfer.