If you're going to be doing a lot of gaming, don't get a laptop. Their mobile chipsets just aren't as strong, cannot really be upgraded, and are quick to go out of date.
I myself game with bootcamp on my Mac Pro, but I've also used PC towers in the past. I gamed with my MBP when I bought it, but it just can't keep up with the games these days. Other than a little starcraft or civ (can't wait to get V, btw), I don't game on my laptop.