Hey Mobius. Just a warning with Alienware from past experiences though I realize Dell bought them back in March. Dont let their fancy marketing sell you on their support and whatever you do dont use their credit program. I bought two Alienwares a couple years back specifically so I'd have a warranty since I was tired of having components fail in my home builts over time. Components in the Alienwares failed and we consistantly had a hassle trying to get them replaced. It also took literally months to get my system in house due to dozens of logistical problems on their end. I was told in email many times that it was "shipping tomorrow" and it didnt ship till weeks later. I have a number of guildmates that had similar experiences and the ones that used the credit program had even worse issues.
If you're deadset on wanting to buy a high end pre-built you may want to consider
Falcon Northwest or
Voodoo PC