thor220 :
If I could recemmend something at the $ 300 price point I would go with a Llano based machine. I built two over the summer from newegg for around $ 280-300. If your smart you can get coupon codes to make the price cheaper. A Llano based machine will also be better for upgrading when you want to get a new graphics card.
An Intel will be much better for a discrete GPU.
Llano excels at extremely budget-oriented users (like the OP) but it slows down once you put in anything higher than a 6670. Llano is just an enhanced Athlon II in terms of CPU performance.
But since this guy might be using a 6850, Intel is the way to go.
Llano is the other way if you want a completely, locked down PC with a 6670- which still performs well in many games.