While you're asking for suggestions under $200 you might still want to at least try some top of the line ones so you at least know what you're getting into...
Thankfully someone pointed me in the right direction before I spent too much on intermediate gear :-)
2 months ago I regarded anyone spending $1000 on headphones insane, - then I listened to HD800...
2 weeks ago I regarded anyone spending $5000 on headphones insane, - then I listened to SR-009...
Anyway, many stores will let you borrow their listening room for a few hours just sampling models, bring some music you know in qood quality and try some stuff out, and don't ask for the prices til after you've made up your mind, - you could be positively surprised :-)
And just to get you started: the Sennheiser HD280Pro's are very isolating, leak very little, easy transport as they fold up, and are in my opinion comfortable for closed cans.
I used them at work because I can wear them 3-4 hours without problems, I don't get disturbed by coworkers and noises, and I don't disturb the people around me almost no matter how loud I play... (oh, they are no good if you have to move around a lot)
(avoid the new 380's, they leak a lot more sound and do not isolate as much as 280)