Had a friend with an Alienware tower a few years back, and he LOVED it, but he paid a TON for it.
He said it was pretty much off-the-shelf composnents, with a snazzy case.
...I think the cases are cool personally, but i couldn't justify the current price as I configured it from thier site too. (ouch!)
Israel "Izzy" Long
Motion and Title Design for Broadcast-Film-DS
izzylong.com