Have you looked at the YouTube video I posted? It should answer any questions you might have. I'll re-post it here:
http://www.youtube.com/watch?feature=pla...PIXAtNGGCw
This is another helpful link that is strongly related:
http://www.newegg.com/Store/Computer.asp...r-Hardware
The videos are a little out of date (the next generation of graphics cards and processors have come out), but they are still very helpful.
several things I would recommend about these builds: get 8GB of ram instead of 4GB. It's not much more expensive, but it will prevent any RAM bottelnecking, and will pretty much be the maximum you will ever need (unless you frequently blow up massive amounts of TNT in Minecraft like me).
In general, I recomend doing lots of research before buying important parts like your motherboard, processor, and graphics card. Also, make sure to go overboard with your power supply in case you want to upgrade in the future (a mistake I have made before).
