Could use your guys guidance. Right now I have a pair of HD555 by Sennheiser. For the most part I like the way they sound but I would like something better. My problem with them is they are not very comfortable for more then an hour or so. So for around $200 with comfort being #1 thing. What would you buy? The Audio Technica ATH-AD700 looks good as right in there own advertising they talk about comfort. My only problem with them is I dislike the 1/8 jack. I know they come with a 1/4 adapter but it still bothers me. I will be using the headphones for gaming/movies mostly with some mixed music as well. I will be powering these phones with a ASUS Xonar STX sound card.
Thanks for your time
Comfort is a very fuzzy thing to qualify for different people. In general, you want something with a light clamp which spreads pressure evenly, but has just enough to stay on your head securely.
The most comfortble headphones I've owned or tried (in rough order): Phiaton PS500, Audio Technica AD700/A700, Senn PX100/100-ii, Senn HD228, B&W P5
which are all quite different in how they distribute pressure.
The audio technica wing system is comfortable, but I also have a fairly wide head. Those with smaller heads have reported having trouble keeping the headphones on. the Phiaton is just super comfy due to its very soft earpads, but the pleather pads mean they will feel warmer compared to your 555 velour. Small supraaurals (Senn PX100, HD228, B&W P5) can be very comfortable, but some people don't like the feel of anything on their ear. The clamping pressure if also seemingly a greater factor for supra than for circumaural cans.
So anyhow, all this blathering really comes down to one thing: try a whole bunch of different cans if possible and see which feels best to you. In many ways, comfort is just as important as sound quality.
The AD2000 is generally regarded as one of the best headphones for female vocals. If you get a chance, try either the AD700 or AD900. If you like the sound and comfort, then consider moving up to the more expensive AD2000. If you want to buy without trying, the used pricing here is about $400 (maybe a tad more as they've been scarce lately) so you won't be too far off if you want to sell it to recover finances to try something else.