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Your not bottlenecking the GTX 560ti, but you would bottleneck a GTX 670 in some games, for a GPU like that i would say you should get a 2500K / 3570K.
Or just wait a while see what Haswell or Piledriver have to offer, Piledriver should be out before the end of this year.
If you have the money and can comfortably spend it, then go for it.
I made the jump a couple of weeks ago from a 1055T to a 3570K and it massively improved my playing experience in games like Shogun 2 and Battlefield 3. But then I am using it with a 680GTX so I was probably seeing more of a bottleneck with my AMD CPU, so you may not see the massive jump that I did.
What games do you play?
I bought a 7970 and that was the reason for my to ditch my 955 and go intel. Since you're only on a 560 I'd wait for the next cpu series, unless you are upgrading your GPU soonish then go ivy.