It's a nvidia chipset, which is quite old and lacks modern features.
Asrock 970 Extreme4 AM3+ $105 (10 rebate, $7.87 shipping)http://www.newegg.com/Product/Product.aspx?Item=N82E16813157262
A high quality 650W PSU would be enough for your build even with a second GTX 460, but there aren't that many 650W PSUs with four PCIe connectors. And if you ever wanted to go for two more powerful and power hungry graphics cards then 750W would be the better choice.
If you are interested in a 650W PSU with four PCIe connectors then the XFX Pro 650W Core Edition 80Plus Bronze is one of the cheaper candidates.