I think the Nvidia GTX 650 ti is in your price range. AMD gets you a 7770 ($100 or less), 7790 (~$120 or less), 7850 (~$120 or less). I see a lot of rebates on Newegg which put 7850s for around $100 to $130.
I think the deals are with AMD right now. Nvidia seems to have less sales but I think they are selling off the geforce 6xx stock so deals will come for them.
Could you link to me a good benchmark site so I can see how they fair against each other, I'm not sure where to look. Also, in your opinion which of those have the best price-to-performance?