I've just put together the following system:
Antec 900 case
Motherboard
Gigabyte GA-P35C-DS3R, iP35 Express, S775, PCI-E(x16),
DDR2 & DDR3 1066/1333/800, SATA II, SATA RAID, ATX
CPU
Intel Core 2 Duo E6850 3GHz
RAM
Corsair 2GB Kit (2x1GB) DDR2 1066MHz/PC2-8500 XMS2...