Best Regular MBP for gaming?

I've begun saving for a MacBook Pro (non-Retina) and am curious what would be the minimum amount I'd need for gaming on Boot Camp (Windows 7). After looking through the specs of each, my initial goal of a 13" Pro is in doubt because of the graphics chip. $2,200 will take a while to scare up for the best of the lot, so I'd like to figure out what I can get away with for games like Skyrim or Dragon Age II.