Intel Sandy Bridge is probably a better price/performance CPU than AMD Phenom II at the moment.
Haha, not even close. Competitive intel chips are more than double the cost of adequate AMD chips. You've just bought into the hype. Go check the gaming benchmarks, and note the minor differences in performance. It's a joke, imho. Sure, intel offers a better chip for other types of computing, but for gaming there's almost no advantage.
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103727 $134.99 (AMD)
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115071 $299.99 (Intel) i7
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115067 $209.99 (Intel) i5
Difference in gaming? Negligible at best.
Benchmarks: http://www.tomshardware.com/reviews/phenom-x4-965,2389-8.html