Do I need to buy a heatsink or will my mobo come with one?

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131402

Well I'm about to order, I've taken your advice and that combo is VERY nice.

My only worry is that it all won't be able to fit correctly... like how would I know the motherboard will match up to the case?

I don't want to order the case and it not match up and fit correctly.

http://www.newegg.com/Product/Product.aspx?Item=N82E16822148395&cm_re=seagate_500gb-_-22-148-395-_-Product

OR

http://www.newegg.com/Product/Product.aspx?Item=N82E16822136319

Obviously I'd rather have the cheapest one, but if it's going to be that much of a difference for the price I'll go ahead and pay the 20 more for the WD. Opinions?

It wasnt my intention to use two 5870s, I just wanted one card. I did change to that mobo you suggested (

http://www.newegg.com/Product/Product.aspx?Item=N82E16813131402&cm_re=asus_790x-_-13-131-402-_-Product)

, every thing seems set in stone except for the power supply...the one from my old comp is 375w, I dont think that will cut it will it?

300 dollars is way too much for a hard drive, for me. With that I can go back to my original setup of i7 and the gtx 480.

I've been looking at power supplies but don't really know what I'm looking at. Does someone mind "holding my hand" and finding me one that's not too overkill but will be sufficient enough to tackle what I'm trying to accomplish with my build?

It's a work in progress lol, the cheaper the better (without losing much performance). I think I've settled on a build that I feel comfortable with, well mostly. Here's my updated build, tell me if my power supply is powerful enough, and if there will be any bottlenecking occuring:

MSI 790X-G45 AM3 AMD 790X ATX AMD Motherboard 99.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16813130249

GIGABYTE GV-R587UD-1GD Radeon HD 5870 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready Video Card 529.98 http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.383391 AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor Model HDZ955FBGMBOX

Western Digital Caviar Green WD6400AADS 640GB 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive 54.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16822136527

Rosewill RP600V2-S-SL 600W ATX12V v2.01 SLI Ready Power Supply 54.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16817182032 G.SKILL

Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL 109.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16820231277

COOLER MASTER Storm Scout SGC-2000-KKN1-GP Black Steel / Plastic ATX Mid Tower Computer Case 79.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16811119196

A better power supply? Damn I was hoping to use my old one from my Dell XPS 400 to save some money... if I can just drop 200 dollars this would be in my price range.

I use the world of warcraft gaming mouse, even though I don't play WoW... I got it on sale at best buy for 60 dollars a few weeks ago. It's got like 10 or so buttons on it you can macro anything, best gaming mouse I've had for the price, and it has a nifty glow effect.

Okay by doing some research I brought it down to 1200 thanks to you. Here's a replacement mobo, gpu, and cpu, critique? Also I'm not sure about RAM usage with this mobo either, will the ones I linked before be optimal?

ASUS Crosshair III Formula AM3 AMD 790FX ATX AMD Motherboard 199.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16813131392&cm_re=AMD_socket_AM3_motherboard-_-13-131-392-_-Product

AMD Phenom II X6 1055T Thuban 2.8GHz 6 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Six-Core Desktop Processor 204.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16819103851&cm_re=AMD_Phenom_II_x6-_-19-103-851-_-Product

HIS H587F1GDG Radeon HD 5870 (Cypress XT) 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card w/ATI Eyefinity 424.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16814161301&cm_re=5870_radeon-_-14-161-301-_-Product