[quote name='hpbbes']ut my buddy says that parallels really sucks up memory, making it difficult to run games.[/QUOTE]
Don't buy Parallels. Parallels is terrible. Buggy and unreliable. VMware Fusion is much, much better, *however* it is not for games, at least not 3D ones (neither is Parallels.) There is overhead associated with VMs that slow it down a bit relative to booting natively (though it is still quite fast), plus they have only limited 3D acceleration support and that's the game killer. VMware considers their 3D support "experimental" (and everything about Parallels is "experimental" regardless of how they describe it.)
If you want to run Windows games on your Mac, Boot Camp is definitely the way to go. You'll get full native speed and acceleration and full support for your games. If you want to run other kinds of Windows apps on your Mac, though, Fusion is fantastic, and much better than switching back and forth between Windows and Mac OS X. However, as you note, if you want to run Fusion (or for some inexplicable reason, Parallels), be sure to have lots of RAM in your Mac. I'd say 2 GB or more.