XML2 skin conversion is easy enough, so if any of those Cyke skins you want are in there, converting them and the portraits (minus the background issue Noelemahc is working on) is a cinch. Darkmythology is working on the powerset, so once he finishes, any extra skins already available that you want I'll be glad to convert (although, if you have the same issues I do with the black spots and blue edges on imported skins, this offer isn't exactly the greatest).
I'm avoiding doing any full replacements, at least until after the psp guys get done, but I've thrown in a bunch of XML2 skins, like Sabretooth for Black Panther, Rogue, Sunfire and Pyro (yes, he can fly now, that MGH is some powerful stuff) for Human Torch, Jean Grey for Invisible Woman, to name a few. I like adding characters, I'm just too greedy to give up anyone. In fact, I'm actually running out of ideas of who to steal out of XML2 next, so any suggestions would be welcome.