Thanks justhavingfun, excellent feedback. I was looking to go as high as $250 to $300 but the problem I'm having is finding a local dealer to audition a set. I'm in the north Dallas area and have used different manufacturers website to locate local dealers but I'm having minimal success. Circuit City and Best Buy don't carry the higher-end models and Tweeter (suppose to be a dealer for Sennheiser) doesn't have anything in stock. Grado gave me one possible source but it's kind of far but maybe I'll make the trip.

Headroom seems to have a good price for the HD600 but I hate to buy without listening and I hate to take advantage of brick&mortor stores and then buy online. I may have to go the route of buying online from someone who has a money back guarantee if I'm not satisfied.