Could anybody recommend me a specific type of athletic shoe? I'm looking for lightweight athletic shoe that I can use for martial arts. There are some specific things I need in the shoe because my feet suck: I need the shoe to have a flat sole, removable inserts, either come very wide or have the option to get up to 4E wide, and preferably be high tops.  I thought I had found the perfect shoes for my criteria with the Nike Free Train Instincts, but the shoes were much too slim and would squish my feet and I can't get them in a wider size. If I could get shoes like those but in extra wide, that would be perfect. 

Does anybody have any suggestions? I'm wiling to spend up to $300 for a pair of good athletic shoes.