Ahh.. the old Bloomfield... Still great cpu, AND 8 threads. I think you should think about 7790, which is slightly over your budget, but you can get one for as low as $110 with rebate. http://www.newegg.com/Product/Product.aspx?Item=N82E168... This beats any gpu around the same price range. It is equal or better than the once mighty HD6870.
I'd have to +1 goonbar, if you can afford the extra $10 for a 7790, AMD's got the price/performance crown at that area, the 650 ti boost just hasn't come down to the same price, so i can't recommend it. The 7750 is the most powerful slot powered GPU you can buy right now as well, so like Onus said, it depends somewhat on your PSU