getting a new gaming pc

hey, im trying to do a bit of reasearch of what to get in a new gaming pc.

if anyone has any suggestions of what to get i would be very appreciative i plan to spend $2000-$2500.

if anyone could give any advice on what type of computer to buy or even just some basic tips it would be great, thanks.

CPU: E8600 or Q9550

Ram: 4GB 1066

mobo: P45 or X48

GPU; HD 4870 or 280 gtx

PSU; 750 corsair or pc power & cooling

maybe 800+ if doing sli or crossfire

CPU: Intel Core 2 Quad Q9550

CPU Cooler: Tuniq Tower 120

MoBo: Asus Maximus II Formula

GPU: VisionTek HD4870x2

PSU: Corsair HX-1000W

RAM: GSkill 4Gb (2x2) DDR2 800Mhz PK

HDD: Western Digital Caviar SE16 7200Rpm SATA II 640Gb

Case: Antec Twelve Hundred

Drive: Asus DVD±R 20x DRW-2014L1T LightScribe (SATA)

Sound Card: Creative Sound Blaster X-Fi Titanium Fatal1ty Professional

If you're from USA, search this on www.newegg.com