Shuttle XPC SP35P2 Pro (a nice little compact system) with Q6600 quad-core OC'd to 3ghz, 4gb ram, 640gb+500gb+1tb, nVidia 8600GT, DL/DVD+-RW. It's an amazing system, and it's portable too!
I also have a Sony VAIO S270, 2ghz single-core, 1gb ram, 160gb, Radeon 9700, which I use for general browsing/messaging. It feels quite dated despite reinstalling the OS, so I'm thinking about selling it while I can still get a good return on it (it's in excellent condition). If I can find the money, I'd love to get a
Lenovo U110.
My friend just got the XPS M1530 with the 15.4" 1920x1200 screen... it's quite a dream.