I'm looking to upgrade from a GTS 250 and want to move up to the 600 series. I play games like WoW. I was wondering how much of a performance difference there was between a 650 ti boost that they came out with from a 660
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The 650ti Boost is a seriously better value than the 660. The vanilla 660 is only a tiny bit better than the 650ti boost. I'd go with the 650ti boost out of the two.
I agree with Neospiral, gtx 660 isn't worth it. Also the GTX 760 might be worth considering and has great performance for the price, although it is a little more.