You shouldn't have any issues at that resolution. Your setup is very similar to mine, and I can play games like FarCry 3, MWO and Skyrim on high at 1080p...and that's with a second monitor attached to the GPU for TS3 etc. I'd definitely recommend waiting...if you find yourself having to go to medium, then upgrade then.
In the meantime, if you have the funds, put it towards a 1080p monitor. A 560Ti won't struggle with it.