I was in your position 2 weeks ago. My setup right now looks exactly the same. Go for the X4 instead of the X2. I got the 4870 instead since it was cheaper and somewhat faster (from what I've read), the only thing the 5770 has over the 4870 is the DX11 support, other than that they are almost identical.

If I were you, I'd spend an extra $60-$80 on a decent power supply. I wouldn't really trust a power supply that comes with a $35 case. If you stick in a 48xx or a 57xx video card, I'm pretty sure it needs 2 6pin connectors.

Here's another one...
http://www.maximumpc.com/article/fea...647?page=0%2C0

I was going to look into building a budget gaming rig but I think I will just steal this setup

what about BIOS setup? is that hard?

another one

http://www.buildacomputerguide.com/