Here's s a build worth taking a look at imo. This build allows you to add another one of those factory over clocked gtx 560's for SLI. That cpu cooler down below comes with decent thermal paste, and this build includes Windows 7.
http://www.amazon.com/Cooler-Master-Enforcer-Interior-SGC-1000-KWN1/dp/B004WK3KKQ/ref=sr_1_9?s=pc&ie=UTF8&qid=1309227536&sr=1-9 $79.99 & this item ships for FREE with Super Saver Shipping
Cooler Master Storm Enforcer USB 3.0 Mid Tower ATX Case with Window and Black Interior (SGC-1000-KWN1)
http://www.amazon.com/Cooler-Master-Computer-Cooling-R4-LUS-07AR-GP/dp/B002LE8BJA/ref=pd_bxgy_e_img_b $14.31 & eligible for FREE Super Saver Shipping on orders over $25
Cooler Master Computer Case Cooling R4-LUS-07AR-GP 200mm red LED case fan
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.668398 $154.98 + $15.00 Mail In Rebates
CORSAIR Enthusiast Series TX750 V2 750W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply
Seagate Barracuda ST31000524AS 1TB 7200 RPM SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.674958 $188.98
GIGABYTE GA-Z68X-UD3-B3 LGA 1155 Intel Z68 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBXL
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.662487 $454.98 $20.00 Mail-In Rebate Price After Mail-In Rebate(s): $434.98 FREE SHIPPING
Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor BX80623I52500K
MSI N560GTX-TI Twin Frozr II/OC GeForce GTX 560 Ti (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
http://www.amazon.com/gp/product/B002G1YPH0/ref=ox_sc_act_title_1?ie=UTF8&m=ATVPDKIKX0DER $29.51 & this item ships for FREE with Super Saver Shipping
Cooler Master Hyper 212 Plus 120mm Sleeve CPU Cooler, RR-B10-212P-G1
http://www.newegg.com/Product/Product.aspx?Item=N82E16827106289 $18.99 FREE SHIPPING
LITE-ON DVD Burner - Bulk 24X DVD+R 8X DVD+RW 12X DVD+R DL 24X DVD-R 6X DVD-RW 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM Black SATA Model iHAS124-04 - OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116986 $99.99 FREE SHIPPING
Microsoft Windows 7 Home Premium SP1 64-bit - OEM
Total: $1,041.73 *not including shipping, mail in rebates, etc...
Total: $1,291.72 for dual gtx 560's in SLI *not including shipping, mail in rebates, etc...
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127565 You Save: $5.00 $249.99 (Before $20.00 Mail-In Rebate) FREE SHIPPING
MSI N560GTX-TI Twin Frozr II/OC GeForce GTX 560 Ti (Fermi) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
http://www.coolermaster-usa.com/product.php?category_id=19&product_id=3038 <----- more pics, specs, and professional reviews of that case