[David Conrad]

Comfort of these. I want to wear these all day every day. 
 
 
 
I'll also throw in the seinhiesers in this price range. HD 600 and HD 598
 
598: http://www.amazon.com/Sennheiser-HD-598-Over-Ear-Headphones/dp/B0042A8CW2/ref=sr_1_2?ie=UTF8&qid=1441558153&sr=8-2&keywords=HD+600&pebp=1441558172715&perid=0BK72YTY3WCHC8H4NBDM

 

[PurpleAngel]

It would help to know what sources your going to be plugging the headphones into?
The Audio Technica headphones are headphone amplifier optional (best with a low impedance amp)
The Beyers need to be used with a decent headphone amplifier (great for plugging into receivers)
Assuming the Mad Dogs would work best with a decent amp, not sure how well they work without a decent amplifier?
 
I think I would prefer the ATH-AD900X, over the other headphones (maybe the Mad Dogs would be the best pick?).
 
The HD600 would be a little more preferred for music and the HD598 maybe better for FPS gaming (between the two Sennheiser models)
HD600 need a decent amp,
HD598 amplifier optional (but better with one).

 

[Moogs]

I own the 770 and 880 and they are both equally comfortable. Perhaps the most comfortable phones I have ever worn until I get my Alphas.
 
Ive owned ATH-M50, which are good for the price, PSB M4Us and Nad 50s I think they were called and they crushed my head.