Building a Gaming Computer Confirmation of Parts

[DustyMouse]

Hello everyone. A few days ago, I asked the community if they could help me with choosing parts for a gaming computer that has a budget of $600-$700 (I'm willing to go up to $800).
Here is my results:

MoBo:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128510
Case:
http://www.newegg.com/Product/Product.aspx?Item=N82E16811322016
Processor:
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103996
GPU:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150540
PSU:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341017
Memory:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233180
HDD:
http://www.newegg.com/Product/Product.aspx?Item=N82E16822145299
OS:
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116986
Optical Drive:
http://www.newegg.com/Product/Product.aspx?Item=N82E16827136240
After-Market Cooler:
http://www.newegg.com/Product/Product.aspx?Item=N82E16835103065

$782.93 and $45 MIR.

*I will also be buying an anti-static wrist strap, and thermal paste.

This is the first computer I'm building, so ANY input would be appreciated.
I guess what I'm asking is:
Are there ways to improve this, but still stay in my budget?
Are there ways that I can decrease the cost, but still expect similar performance?
Can this computer be an okay gaming computer (medium-high settings for all those new games)?
Are these parts compatible with each other?

Again, any input is greatly appreciated. I understand that I have a lot of questions and a ton of things to look at, but I am really interested in building a computer. Your time and help means a lot to me.
Thank you.

 

[o1die]

If the egg is still out of your ram pick, gskill, patriot, pny, and kingston will also work well. OCZ is a good power supply, very quiet. You may find windows 7 pro or ultimate for about the same price as your newegg oem copy on craigslist. Just be sure it's sealed.

 

[DustyMouse]

Thank you for your RAM suggestions and reasons to keep the power supply I chose. I think I'll stay with Windows 7 Home though, as I'm paranoid with buying from people rather than companies.
Does anyone know if I will have any compatibility issues?