Grab yourself 2 HD4770s and a motherboard that supports crossfire (X58 chipset) and away you go. Now... for the rest:
CPU: Go for the 920, like mi1ez said
Mobo: Of those two, P6T, I prefer Gigabyte myself though
RAM: Not sure how you're getting 4GB with tri-channel, get 6GB in a 3x2gb kit and a 64-bit OS
HDDs: Personally, I prefer having one drive for my OS, and another for games. Especially true if you're running a server.
Case: Antec 1200 for the win.
Keyboard + Mouse: Wireless + gaming = bad idea... unless you get that new Razer wireless mouse that performs as well as a wired... either way, get wired. Razer would be my preferred manufacturer
Speakers: Once they do the job, whatever. I prefer headphones.
Heatsink: The V10 is huge... and doesn't really perform better than other offerings... a Xigmatek S1283 would most definitely perform better.
Monitor: 19"? Bit small for my liking but hey, it's enough for most people. Could go with a single 4770 with that resolution... or if you want more power, a 4870 or 4890.
OS: Probably better off getting the Windows 7 64-bit RC then purchasing that when it comes out later this year.
Intel i7 920
OCZ Gold 6 Gb PC3-12800C8
2 x 750 Gb Samsung F1 or Western Digital ....it's better to have 2 smaller hdd instead of a single big one
Coolermaster HAF 932... really good airflow
Corsair TX 750W ....for future upgrades (SLI)
Nvidia 295 GTX
Thermalright Ultra-120 + Noctua 12 cm fan
HP LP2475w but if you don't want to spend too much, go for a Samsung one 24"
If you want some nice speakers, look for Logitech Z-5500. Depends on your budget.