Gaming Build, Some Questions

Hey, I'm pretty much buying a new build (within the week at least) consisting of the following parts:

CASE: Antec Three Hundred
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

HDD: Samsung Spinpoint TB Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

RAM: G.Skill Ripjaw 4gigs
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

OS: Windows 7 Full (Don't really need a link here, do I?)

And then a combo deal consisting of:

MOBO: Some ASUS AM3 Board
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CPU: AMD 955 Black Edition
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I've already got a keyboard, mouse, monitor, thermal compound, video card (GTX 260 Core 216) and a 750 Watt Single Rail PSU, along with pretty much any cables/additionals I'll need for the build.

This in total (with current deals) comes out to around $610, which I thought was a pretty amazing price range, but I could be wrong. This is essentially my first "full" custom build, and I'm not entirely certain if this is the best bang for the buck. I am limited by pricing, and this is about 40 dollars short of budget, which is good.

In short, I'm just wondering if you guys have any considerations on the build, or if you've noticed whether I've got some serious flaw somewhere in the build in terms of compatibility. The last thing I want is finding out I've made some fundamental flaw later on down the line. Any suggestions or general help are greatly appreciated. Thanks!

Quick notes:
-I'm not buying another video card or PSU at this time, but later on I'm considering switching over to ATI cards. From what I understand though, my current card and mobo are completely compatible.
-It's a gaming PC (duh!)
-No real parts preference.
-Will consider overclocking.
-Monitor runs at 1680x1050 (if that's relevant).
-Budget (tops) is $650, but I'd rather stay under that limit.