Ok, like most people I haven't a clue which card to pick. My CPU is a I7 920 clocked to 2.9GHz. 6mb of ram (upgrading to 12mb). Like to be under $250.00 for the card. Asus P6t Board
One of these GTX 1060 3GB or one of the RX-470 4GB will allow you to max out settings at 1080p/60 Hz.
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&IsNodeId=1&N=100007709%20601206485%20601210955%20600007787%20600286741