I am looking into buying a 400 or 500 size quadcopter to be used for some sport flying, as well as some aerial photography. So far I have looked at the Xugong Pro, QAV400, as well as the Cinetank Mk2. Is there any other good frames in this size bracket (400 to 500)? I would like to have the ability to carry a gimbal, but also be able to fly without it (thats why the QAV400 looked good). Thanks for the help.