sound quality on the m30 is decent but they have horribly small soundstage and the earcups are fairly shallow. the hyper x cloud might not be the best around and the microphone is only adequate but for the price it is certainly a decent choice.
the ad500x (if you want bass light, large soundstage , gaming advantage for fps) or the hd518 (fairly neutral) are decent open cans for gaming. likely a better choice for gaming unless you wanted lots of bass.