Aight heres my 2 cents...
AMD processor single core because gaming only uses one core. Better off putting the price difference from X2 just into a single. I think the AMD 4000 is a great buy.
Check out this RAM. It seems to have a better rep but idk much about ram
As far as a motherboard goes, just get an ASUS A8N Premium or something. Asus is a solid mobo maker. They support SLi too if you ever wanted to do that down the road, which is add another identical GPU as a plan for upgrade.
IDK your budget but if its tight check out that stuff.