I promised myself I would wait until at least the 760 ti to upgrade, but this thing is a beast.
http://www.tweaktown.com/reviews/4869/nvidia_geforce_gtx_660_ti_2gb_reference_video_card_review/index1.html
http://www.tweaktown.com/reviews/4869/nvidia_geforce_gtx_660_ti_2gb_reference_video_card_review/index1.html