Try this one:
Pick up some extra RAM at newegg.com and take your pick of 256Mb video cards and you are still sitting comfortably under $1500.
Of course I spend my life bottom-feeding and finding refurbished systems with legal Windows. This is still a great price when you consider the warranty and the cost of a legal copy of Vista.
Folding@home prefers additional L2 cache, but the E4400 will still work just fine.