-An Intel build won't be nearly as cheap so stick with the AMD CPU and what's your monitor resolution? If it's like 2560x1600 you might need to get an Intel build
-Okay the overclocking will help speeds a bit not sure about an exact percent I don't know
-By QVL I mean qualified vendors list basically it's a list for every mobo which states with memory modules are supported it can be found on Asus' website: http://usa.asus.com/product.aspx?P_ID=YATvwCy0OZLGNWwp&...
I just checked it for you and it seems it's not supported that doesn't mean it won't work it just means you'll have to manually set the timings
Directions to download QVL
Go to the memory support tab
The second one is the one you want download it and view with Adobe Reader
Okay, first monitor resolution the AMD build should be fine and the GTX 460 should be able to handle 1920x1200 with the 1440x900 as a secondary non-GPU monitor.
It's not gonna max every game but you should be able to run at high level detail
RAM yes it's just in the BIOS and I'm sure you'll be able to figure it out