What laptop should i buy, and from where?

I'm a big gamer on the computor: world of warcraft, minecraft, etc… And i want to get a good fast working high data laptop… What brand should i get and what graphics ram and gb should i be looking for… Also were would be the best deals for a "good" laptop. I like macs but there exspensive, is it worth the extra price. And what does macs have that newer windows don't?