No knock of the current team, but my favorite X-Force team is:

Basically the New Mutants, but I love that whole story arc where they strike out on their own sans 'adult' supervision. No Professor X, no Magneto, no Cable. Just a group of wayward teenagers with superpowers. Very Runaways-esque.
It may also have something to do with the fact that I was a wayward youth at the time, and the idea of a cross-country road trip that culminates at the Burning Man Folk Festival was truly awesome!!!

By the way, there's some crazy "Where's Waldo" type stuff going on in this picture. Leather fetish abounds. There's an androgynous person riding atop anther another person who has a horse's head. Women grinding each other. Is the woman on stilts nude? Siryn's doing something vulgar with her mouth and fingers. And look at the guy in the lower right corner - creepy 'O' face.