So my wife bought me a new computer for the holidays since my old computer didn't meet the requirements for a lot of newer games. Anway, when she got the computer, it came with a NVIDIA GeForce GT520 video card and the guy suggested that she also puchase the Radeon HD6770 and have me replace the NVIDIA card. I know really nothing about video cards and hoped you guys might have some insight as to whether I need the Radeon or if I should return it and just stick with the NVIDIA.

The game seems to run fine so far with the setings on high, but I guess I don't know what I am missing if I haven't see it with something better. Thoughts and opinions on the cards? Is the Radeon much better?