i see you're running dual gtx560s. are you using an nvidia sli profile?
with v-sync enabled you're going to incur some input lag...how much? depends, if you're running good "newish" equipment with an actual monitor, and don't have a lot of things plugged into your system, not enough to worry about. there are some newer models of lcd televisions that have input lag times lower than computer monitors...and there many more that have really high input lag times. just have to choose carefully.
if you want to run higher frame rates with v-sync enabled, you could try one of the newer 120hz monitors and use the display port connection. it's going to be a bit pricey compared to a standard 60hz lcd monitor but, combined with the latest upper end video cards, those who can afford the upgrades are loving the results.