[String7th]

I went computer part shopping with a computer buddy of mine and was tought the basics of building your own computer. I wanted to get other tech-superior opinions. Not really needing, "you need more ram" but more of opinions like, "that CPU will not fit the motherboard"

A: 4-U server case. 400watt power supply.
B: ECS-brand AMD motherboard capable of 3 pci slots, plus 1 pci-express, 4 Ram slots up to 32 gigs.
C: 4, 1gig sticks of ram. They sell in pairs and I'd rather have 4 gigs than 2.
D: AMD Phenom cpu, tripple core, 2.3 ghz
E: cheap dual out video card
F: cheap Firewire PCI board, firewire only instead of USB/FW (Iremember Brandon's post about his chipset thing.
G: Internal greenpower 250gig HardDrive, plus 400gig external HD
H: Windows XP

My main concern is that something may be missing. I've never build a computer before and I may be putting this all together and through multiple failures, someone says, "well this part here will never work with that there."
Anyone who has built computers before, please let me know if in theory, this set up will be everything I need.