the 7850 and 560 448 are going to be fairly close in price & performance so you might look at features. If you want to do surround gaming then then 7850 is a better choice. If you want 3D or Cuda (for F@H, accelerated trans-coding, etc) then Nvidia is the better choice. The other two cards should play TOR and D3 just fine as well if you want to save a few bucks.
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station…