GTX 560 TI 1024Mb here. I run Most settings high, water and shadows medium, no heat blur, no civ traffic, no mirrors.
While playing my GPU temp maxes out at 64c, fan 75%, usage 99%, memory 1014Mb. Single monitor 1920x1080.
Just bought it last year so might have to make do for awhile, I'm pretty happy with the way the sim plays.