Like others here, I've decided to upgrade to a new system. Here's what I've chosen for parts:

Cooler Master COSMOS 1000 case
ASUS Maximus Formula II mainboard
Intel Q6600 CPU
OCZ 4GB PC2-6400 memory (2 x 2GB kit)
Seagate 1TB HDD (32MB cache / 7200rpm)*
ATI Radeon HD3870X2 video card
Thermaltake 850W Power Supply

*I'll be adding my existing 4 x 500GB drives in RAID5 as well

Can't wait to receive this system in a few days - should perform well. Of course, I was really wanting one of the upcoming Yorkfield 45nm quad-cores, but I don't see them coming anytime soon.