Funny, we just updated/replaced the video card in the gaming PC upstairs (which was almost exactly like the one you list there).
I'm sure there are other choices that are good, but we got this -
http://www.newegg.com/Product/Produc...82E16814130625
I kinda wanted to get the 560, but didn't want to pay that much. It seems like a solid replacement right now, improving all games played on it a good portion (improvement in FPS).
Just some thoughts. Good luck!