Not sure how to start this so I'll just keep it short and sweet, I'm looking for the best headphones I can get for my preferences under 200 usd. I'm a bit tied between the HD 598 (like new condition for about $180 on amazon) the ath-m50s, and the Beyerdynamic DT 770 PRO 80 ohm version. I like most genres of music, the main ones being eletronic, club/dance, pop, and a bit of acoustic/classical (not country). I've heard that the HD 598 lacks bass (was my primary choice), which I do quite like but I wouldn't consider myself a "basshead". in other words, I'm looking for a good bass response that doesn't drown out the mids and highs. I also like to game a lot so a decent soundstage would be nice! I have a titanium HD dedicated soundcard, so hopefully I don't have to worry about an amp. that's about all I can think of, let me know if there is any more information you would like to know to determine the best choice.
The HD 598 only lacks bass if you like bass enhanced headphones. It is open and balanced, unlike the other two cans you mentioned--which are closed and have recessed mids and are also bassy. Being open, the HD 598 also has a much bigger and better sound stage than the closed cans. What the HD 598 won't give you is slam and speed.