The 650 ti is good for 1650x1050, it can play any game with good amounts of fps, but for a triple monitor setup with a resolution of 5040x1050, the 650 ti isn't good for that, you need a better card, i recommend gaming only at one monitor.
I don't think there's a card worth for triple monitor(5040x1050) at that range, the 7850 is better but it's not sufficient for that, both cards supports triple monitor(650 ti nvidia surround, 7850 amd eyefinity) but the performance of the cards are not good enough for that, you need a high-end card for that, for 1650x1050 the 650 ti is fine.
You can find some 7850 on newegg at that price, if you're interested.
Well, Im on a tight budget and dont mind gaming at lower settings at native resolution. My 9800 GT has been pretty good and if I am able to use the GTX 650ti ssc at 100% with my QX6800 then I know it will be better than what I have.
My main concern was to make sure it was a good match between the CPU and GPU.
If you want to play in 3 monitors, you have to spend more in the video card than in the 3 monitors together. I don't think that a system that cost less than $1000 will be good for triple monitor setup. GTX650ti is more than enough for 1680 x 1050 but if you have $170/00 to spend then get the HD7850, it is vastly superior. Also, get a good CPU cooler and overclock your CPU all you can.