NEED HELP on building $800-850 gaming pc

Hello, Im as new as it can get to this site and building computers, Ive been researching for about a week or so. I need some opinions on what is good or not and if certain things are compatible or not. Any help will be greatly appreciated. I'm trying to decide to order from a custom build site or get everything from newegg too. I would like to get a fully fuctional pc (no monitor) but with mouse, keyboard, optical drive, hard drive, video card, mother board etc.
Here is what i was thinking:
http://www.newegg.com/Product/Comb [...] mbo.311727
$552 with rebates
This looked like a good bundle to me, I wanted the i5 750 for the extra performance. I honestly dont need a 1.5 TB of hard drive, 500 GB is fine but ill take the 1.5 TB. I dont know much about the case but it looks cool and the some of the reviews were good.
I want to get this ATI
5770,
http://www.newegg.com/Product/Prod [...] -_-Product
I'm almost building this comp around it. $160 after rebate
and if anyone has any mouse/keyboard/speaker/headset/optical drive bundles or deals that would be great too. I do have some keyboards and mice to choose from but any opinions and suggestions are appreciated.
I also want a computer that will last, i got the video card DX11 so i can play future games as well but I'm mainly going to be playing source games and maybe a few others.
Thanks guys!