nice, i've just built a new system too but not quite in the same league as yours though (tries to stop drooling)
24" hp w2408h monitor, 1920x1200, 5ms, 1000:1, insane brightness (i have it set to 0 in the monitor settings)
this is the most stylish and expensive bit (~£300) (24" really is awesome isn't it?)
athlon x2 5000+ black edition (unlocked multiplier, should be good to 3ghz but i haven't pushed it that far yet, stock is 2.6) (~£80)
2gb ddr2 XMS2-5400 (667) at 4,4,4,12 (or it will be when i've convinced my motherboard that that's what it should be) (~£27)
amd/ati hd3850 265mb (£91) (the 512mb version just wasn't worth the £30 more)
ECS KA3 MVP motherboard (~£45) (2 x16 pci-e, 1 x1pci-e, 2pci, 6sata, crossfire compatible, not great quality but feature packed, esp like the optical spdif to my amp for the hifi)
x-fi music (£50)
i'm just using my old hard disks, 200gb and 320gb sata drives, and an old case and psu (not the plastic crate in my sig though)
AMD athlon 64 3000+, 1GB ddr400, 720GB total hdd, ati radeon X1900gt 256mb (pci-e) 17" tft(@1280x1024).