Building a Computer

Ok, What I need to know is what you guys would recommend what parts I should buy to build a good Computer for Gaming, Videos, Movies, etc. I know the amount of ram I want, 2gigs to be exact, all I really need. But what other stuff should I get? Graphics Card, Mother board, all that stuff. And I mean which brand should I go with etc etc. I'm debating just buying this one,http://www.cyberpowerpc.com/system/Mega_Special_I/ and editing it to be green and green neon with a green optical drive and that would be all I would do to it, would it be a good gaming computer?