Why not the i5 3570K?
HD 6870 is a bit faster than the GTX 560. You can OC the HD 6870 too.
Physx? Even GTX 560 isn't strong enough to handle the most advanced games with Physx technology, you need at least something like GTX 580. And FYI most games depend on CPU Physx not GPU Accelerated Physx...and ONLY Metro 2033, Mafia II Batman AC worth playing with Physx