please no bose :(
from
http://gilmore2.chem.northwestern.edu/ubb/showpage.php?fnum=1&tid=7601:Q3: What good sealed phones are there (in price order)?
Koss SportaPro $29.95 value:3.5 Impedance 60ohm. Actually listed as an open phone, but in reallity leaks little sound.
Made with athletics in mind. Stays on druing most physical activities and can handle sweating ok.
Bass is a bit murky and blurred.
BeyerDynamics DT231 $59 value:5 A great sealed phone in its pricerange.
Sennheiser HD280 Pro $99 value:5 A really good headphone if you look for a sealed phone.
BeyerDynamics DT250-80 $179 value:4 Impedance 80ohm. Good sound.
Ultrasone HFI-550 $189 value:4 DJ-type phone can survive a bit of rought handling and one-ear listening.
For HiFi this might not be the ideal choise.
AKG K271S $199 value:4 Impedance 55ohm. A very good sealed phone for its pricerange.
i personally have akg k 26 p, but the model number has since changed to something i don't know. i think senn hd280 and akg are the best value for your price range
here's a good resource
http://www.head-fi.org/forum/