The step up program is based on the price you paid, which in this case was low. Sort of good news/bad news.
If you step up, make it a BIG jump, or you may be disappointed. I think you should be looking at the GTX670.
Considering that things are running ok now, I think I would pass, unless you have $200 to burn.
In a year, I imagine that there will be better cards at lower prices. At that time, just sell your GTX560 and buy the next best thing.