[First Build] Please Critique - Any Mistakes?

Hello,

I'm looking to build a fast machine that will be good for some gaming (SC2), but also just generally capable (I like to multitask, and I dislike waiting). I want this to last awhile. I've read that overclocking is easier these days, so I may try that out once I have the machine together.

My thoughts on this build is to later add in a second 5770, along with another 4 GB of ram, and possibly a second hard drive for RAID 1.

For reference, I intend to get a 23-24" LCD monitor, either at 1900 x 1080, or x 1200 if I can find one.

Here are the parts, including links to Micro Center (which is conveniently located near my parents):

CPU: i5-760
Motherboard: GA-P55A-UD3 LGA 1156 P55 ATX
Graphics Card: Radeon HD 5770 CuCore 1024MB GDDR5 PCIe Graphics Card
Memory: 4GB DDR3-1600 (PC-12800) Gold Low Voltage CL8 Memory Kit
Case: Three Hundred ATX Mid Tower Case
PSU: TX 650 Watt ATX Power Supply
Hard Drive: Barracuda 7200.9 ST3500641AS-RK 500GB 7,200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive
Optical Drive: AD-7260S 24X SATA Internal DVD Burner - OEM

Total Cost: $843 - $75 in rebates = $769 + Windows 7 + Monitor

I'm still unsure about cooling. Will I want to buy some additional fans, or will the case + processor come with enough, at least to start with?

Re Windows 7: Should I get the "system builder" version, or the regular home premium version?

Anyone see anything that isn't compatible, or something they think is a mistake? I'm open to advice, and I really appreciate everyone's help. Thanks!