$1200, Mostly for Gaming PC

Hi Everyone,
I am going to finally build my first computer. I'm looking for a couple of suggestions, and I really want to stay around $1200. I'm pretty much set on a AMD system, I've read alot about i7 vs. 955 BE and I just feel with my budget I'd have to compromise to much with the i7 components.

The biggest dilemma I have is with the case. This being my first build I would like a case with great cooling and a good layout. Any other suggestions on the other components would be helpful also. Thanks in advance.
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APPROXIMATE PURCHASE DATE: A week at the most
BUDGET RANGE: $1200 before rebates

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming, video encoding, surfing the internet

PARTS NOT REQUIRED:Keyboard, mouse, monitor, speakers, OS)

PREFERRED WEBSITE(S) FOR PARTS: Newegg, Tigerdirect COUNTRY OF ORIGIN: USA

PARTS PREFERENCES: AMD, name brand components

OVERCLOCKING: Maybe SLI OR CROSSFIRE: I will Crossfire

MONITOR RESOLUTION: 1680x1050, I will eventually buy a new monitor with 1920x1080

Here's my components I have picked out

AMD Phenom II X4 955 Black Edition Deneb 3.2GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core Processor http://www.newegg.com/Product/Product.aspx?Item=N82E168...

MSI 790FX-GD70 AM3 AMD 790FX ATX AMD Motherboard http://www.newegg.com/Product/Product.aspx?Item=N82E168...

DIAMOND 5850PE51G Radeon HD 5850 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply http://www.newegg.com/Product/Product.aspx?Item=N82E168...

G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Western Digital Caviar Black WD5001AALS 500GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive http://www.newegg.com/Product/Product.aspx?Item=N82E168...

COOLER MASTER HAF 922 RC-922M-KKN1-GP Black Steel + Plastic and Mesh Bezel ATX Mid Tower Computer Case http://www.newegg.com/Product/Product.aspx?Item=N82E168...

This is one of the cases I have picked out. I'm at $1017 for all this. I could obviously go higher to reach my $1200 and I don't mind if I have a mid tower or a full tower. The extra money could also go toward any other suggestions you guys might have. Thanks for any input