I think most of us think the Beast was better as an Avenger, and some of us are fans of Rogue as an Avenger, and even Sunspot and Cannonball. I think most of us wish Wolverine never answered the call to assemble. Are there any X-Men you would enjoy seeing on Marvel's A-Team? For purposes of this thread, we'll count New Mutants, Generation X, X-Force, and X-Factor as X-Men.
By far my top choice (after the Beast) would be Polaris. Her power would meld great and she'd be a terrific asset on any team of Avengers.
What's your answer?
Phoenix, Polaris, Angel, Iceman and Nightcrawler