If you have two hard drives, a large enough flash drive or external hard disk, or even a cd/dvd burner, you can pretty easily back up a lot of information.

I've done my upgrades for the summer... motherboard, i7-920, 12gb (12,800) ram.

Next summer thinking of one or both:
a) Stronger non-X2 video card + 2nd 30" monitor.
b) Intel gen2 SSD with Win7 and WoW on it.