Yeh that 12-14 fps sounds about right (even a little suprising) I was trying Heaven benchmark, so I'm sure the application you are using will give slightly different results, but as you can tell don't expect much anyway.
Thats what I'm thinking as well, we are at that point were there ARE single GPU cards that are better, but its so little better (and costly) that it isn't worth it.
Now there are dual GPU cards (like the 590) but those are even costlier, so I think its just a matter of waiting.
Unless you NEED the performance increase (I don't), or NEED DX11, I think its worth the wait.
Trust me I've been struggling with the decision since the GTX 480 came out. I was actually bound and deteremined to get a GTX 590 when it came out untill I saw how unimpressive the benchmarks were.