If you're playing at 1080p on a 60hz monitor just get a R9 290 or 780, or 290x/780ti if you want a bit more future proofing (really won't make much difference though). A 60 hz monitor means you're not going to see anything over 60 fps anyway so there is no need to try get Titan Z performance. Also Nvidea should be officially announcing some of their 900 series cards in a few days so you'll probably see some price drops.