Okay. I have two AMD Sapphire 6950's in my gaming computer and I was wondering if a GTX 660 Ti would be much of an upgrade. I been wanting to switch to an nVIDIA card for a while now because most of my game use PhysX and recommend nVIDIA. Is a 660 Ti a good choice or should I choose a different card. I'm looking around the $200-$300 range.