i've owned a pair of the sub $200 (non noise cancelling) bose headphones. they were okay i suppose but i've never had anything decent to compare them with. the noise cancelling ones i tried out distorted the sound way too much with noise cancelling on.
since you have a decent budget you might want to look at the same product i am currently looking into, the Audio Technica ATH-M50(S). It is a studio monitor headset which means although it can deliver punchy bass it is pretty equal across the board and comes very highly recommended by people across hifi forums. apparently since the speakers are only like 30-35ohm resistance you dont even need an amp to drive them and powering them from a pc or mp3 player works fine. though, if you amp them you might get more punch bass and a little more juice out of them, its not required at all from what people more knowledgeable than me (and who actually own the headset) say.
Another major contender to think about is the Shure SRH840.
see the below post (its one of many such ones on the internet)
http/www.avsforum.com/avs-vb/showthread.php?t=1287669
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i'm going to be looking into these headphones hopefully today if they have them in stock. Keep in mind that everyone has their own opinion and as always it can vary. what i like might not be what you like, i'm just passing on what i was thinking about purchasing and that quite alot of people out there put it on the top few list for the under $200 category.