My music tastes are nightwish, trance, and movie soundtracks.
For 200 usd i hope i can expect all i want...good strong bass but not sarcficing over good mids and highs.
Also the build quality is -very- important. And if it dies, i hope there is some good warrenty, wich will also replace the buds if they die of cable damage ect.
Buying used ones is also no problem if you got a good set:)
And a button for iphone control/mic is also nice but not a must.