Extreme Calculator was what I used.
I will be hopefully using this Thermaltake Armor VA8003BWS to house the following.
Nvidia 8800GTS 320mb SLi
OCZ Flex XLC 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 1150 (PC2 9200) (4 gigs)
ASUS p5N32 e SLI mobo
Intel Core 2 quad Q6600 OC'ed to 3ghz
Two western Digital 250mb 7200 rpm HD running in raid
(for now) one DVD RW
Soundblaster Audigy 4 (for now)
Ageia PhysX card 128mb
250mm fan, a bunch of 90mm, and 120mm, whatever came with the case.
LED's 2 UV
USB external HD, USB headset, USB blutooth charger, etc