Basically, the best VALUE of one of these:
HD7870, HD7950, HD7970
GTX660, GTX660Ti, GTX670
Now that the GAME COUPONS appear to have disappeared (too bad) it's actually easier to compare. My guess is that you'll be happy with an HD7870.
Here's my choice (note the CUSTOMER REVIEWS):http://www.newegg.com/Product/Product.aspx?Item=N82E16814125418