I have owned the S4's and finally sold them due to the sibilance and recessed mids. You might want to check out the Yamaha EPH100's. Nice phones for around $100. Much better than the Klipsch
IMO.... You might be able to get a pair of the original Monster Turbines for less than $100. I have not heard the Shure 215's, though I have heard good things about them, and the replaceable cable is a bonus. Good luck!