Newegg has most of their GTX460 768mb cards at ~$160-$170 with free shipping and/or rebates. Either choose the cheapest one, or go for one of the custom models from Zotac, Gigabyte, Asus, or MSI. None will run over $170. Many come with a free H.A.W.X. 2 game.
The Asus DirectCU is $149 after rebate, has free shipping, and comes with HAWX 2.