As you know there is no such thing as future-proofing for computers, so try and get the latest stuff, and sell parts before they become obsolete. My 2 cents.
My recommendations:
Processor - i7 (199 @ microcenter)
RAM - Corsair/OCZ 3gb of ram (unless your going 64-bit) then go 6gb (even then, its overkill), speed is dependent upon MOBO & what you want to do for overclocking
Power Supply - seasonic/ corsair power supply (preferably modular for ease)
Motherboard - Gigabyte, MSI, or DFI lanparty Mobo
Graphics Card - ATI 5850 or 5950
HDD - 10k raptor drive as your main, Seagate 7200 rpm hdd any size as your secondary, or if your feeling expensive SSD
OS - XP or Windows 7 (avoid vista) or OS X (technically illegal)
Monitor - avoid TN panel, if you want quality.
Newegg is the best place to get the parts or you can shop around. I didnt check the price, but i just gave your parts you should try and use! If you have more questions ask. I build computers, as a hobby, for elderly, regular household users, and gamers!
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