for $50 take a look at some Senn PX100's. they've got great sound for the $. Koss KSC75's are also great for the money and you could get a nice modded pair for your price range.
I've got some ATH-FC7's that are in your price range and are fun. not as good SQ as some other cans, but definately an in-your-face upfront sound that is fun to listen to for rock and popular music
I've got some ATH-FC7's that are in your price range and are fun. not as good SQ as some other cans, but definately an in-your-face upfront sound that is fun to listen to for rock and popular music