Well I started looking for a Bluetooth headphone with good sound and isolation, however my preference evolved into an open-headphone wired set that has great sound and will grow in sound quality as I upgrade components down the line. I want to find out what's great about the open style headphones, and is HD 600 a good place to start? Right now I have a pair of ATH-M50 and enjoyed them, but looking for a more "open sound". They are being driven by Behringer UCA202 which has a decent DAC, however may not have enough power to drive HD600 to full potential. Are there good recommendations for inexpensive dac/amp that people like to use with the HD600? My appeal for HD 600 came from many glowing reviews, so I'm not sure there's anywhere I can actually try them out before buying. The neutral response is highly desirable, however slight emphasis on bass would not necessarily be a bad thing at all. Any other headphones people liked better?