I am looking to upgrade from my Asus 7850 2GB crossfire setup to something more current. I get about 75% increase in performance when crossfire is enabled vs. single GPU. I will be playing games such as Shadow of Mordor and Attila Total War at 1080p and possible upgrade to 1440p within a year. I also have a bunch of older games like Metro series (not the Redux), Skyrim, and Dishonored that I play on the side which I would like to max out at mentioned resolutions. My CPU is an i7-2700 paired with 8GB Gskill Sniper RAM at 1866 and Corsair 750W power supply. I am looking to spend no more than $400 USD. I may be interested in purchasing newer games like the new Battlefield and Far Cry 4. Any input is appreciated.