ATI are a lot cheaper, and have been producing better cards recently.
I'm no fan boy. I have a Nvidia card in at the moment, but how things have been going, it'd be ATI next, like the 9800 PRO before this one.
You won't find many people on here with an Alienware. Most people who can afford to spend that much on a rig, would build their own
It looks nice though, thats for sure
That cooler I believe is a Corsair, and I've heard good things about that, as its one closed unit loop, so doesn't take much to prepare.