Tire Sizes - Different kind of question

I currently have 31x10.5x15 BFG AT tires and was looking for something to replace them. I am looking for something a little bigger but do no want to jump to a 33 due to not having the money to regear right now. I know everyone says that BFG tires run small and am currently looking at Goodyear Duratracs, Hankook ATMs and General AT2s. I was wondering in the same size how these compare to the BFGs hoping the others run true to size. I have searched but was unable to find what I was looking for. If you have comparison pictures that would be great. Thanks