that computer is expensive for those crap parts. amd pls..
pci-e is crap right now. it may be the wave of the future like torak says, but i'm almost certain if you get a top-notch agp gpu, it'll last for at least 2 years. by then u'll probably be upgrading again. the trick is to get some overclocking in, it could possibly save you some $.
i put my computer together for about 1100
amd64 3000+
corsair twinxl1024
seagate 80gb sata
msi neo platinum (this mobo sucks for overclocking)
evga 6800gt
19" nec fe991sb
enermax 470 psu (dont skimp on psu if u plan to o/c)
klisph 5.1 ultra (i got lucky with these off ebay for like a bill n half)
sb audigy 2
cd-rw 52x
i think that's pretty much it... most of it was off newegg.com