Alienware M11x R2: i5 and i7 UM versions, Solid build, geforce Gt 335m gpu with optimus, various mem and hdd options.
You mention you dont care about size. This is an 11.6" beast! But it'll run most anything i throw at it from dirt2, NFS: Hot Persuit, Bioshock, Borderlands. All run at very playable frame rates at high settings. You also get displayport and hdmi out, i5 version starts at about $1020 i think (I'm from the UK.)
The only negative, for me at least is no gigabit ethernet. There's also no optical drive if that bothers you. Why oh why Dell did you not fit gig ethernet?!?
I bought an i5 520, gt335m, 4GB, 320GB about 6 months ago coming from a 17" desktop replacement and still loving it! Everyone should have one of these things!
If we cannot be free, at least we can be cheap! FZ.