I need some new headphones for wearing around everywhere. Around the house, playing pc games, and for working out/jogging. I have to use my store credit from circuit city, so my choices are pretty limited. Since I wanted some small, portable headphones with good sound quality I have been considering the Koss PortaPros and the Sennheiser PX100. Any other recommendations? Here is the selection of headphones I'm limited to. My price range is around $50.