Having used both of them, I prefer the GTX560 Ti. It is shorter, quiter, and cooler, while trading blows with the 1GB HD6950 model in game performance depending on which company the game favors (the HD6950 wins in synthetic performance). The GTX560 Ti also runs MUCH more quietly than most HD6950 models. The reference GTX560 Ti model is very solid; it is capable of great overclocks and runs cool at low sound levels.
I would recommend this EVGA model instead of the Hawk due to the price difference and build quality of the reference model: http://www.newegg.com/Product/Produc...82E16814130604