Jaz,
I bought an Alienware Area 51 about a month before Dell acquired Alienware. The Area 51 was very similar to the Aurora line except that it was set up for gaming and the Aurora was set up for business use. The basic chassis was mostly the same (just different plastic shell). The gaming variety used ASUS mothers with Nvidia chipsets. The chipset has always run smoothly for me. The major downfall for using it as a DAW was their cooling system. If you don't go to liquid cooling, you can look forward to an incredibly loud machine - their fan setup was one of the noisiest I've ever heard since the IBM mainframes of the '80s. Fortunately, fate decided to be kind to me - one of the 12v rails in the power supply blew a couple of months ago and it took out the mother and graphics card. I salvaged the hard drives, modem, cd/dvd and sound card and replaced everything else through AVA Direct. Since I was still using XP I wanted to stay with a socket 775 cpu, so I configured a rig with a NZXT Apollo chassis, Thermaltake power supply, ASUS P5N-D mb, E8400 dual core 3 GHz and an ASUS Triton cooler. The first time I ran the machine, I had to look around the side to make sure everything was running because I couldn't hear a thing. You could get something from AVA Direct that will have the horsepower that Alienware puts into their Aurora series for a lot less bucks. My advice is to avoid Dell and configure your own beast.
Good hunting!
Jim