Hi! First of all, I want to thank you guys very very much for all the wealth of information you so selflessly provide here. I would be lost completely if it weren't for you. Now, I have a pair of Bose QC 15, or at least had, until wife got them on her side of the desk. So, I need new headphones. Here is some more additional info: - budget $500 to $700 (after kidney sale). More like $500. - music files in ALAC or FLAC, 100% - I own a Maverick Audio TubeMagic D1 with upgraded OpAmps and Tubes. - PC as 'transport' - I listen to country/bluegrass 50% of the time. Think Alison Kraus, Union Station, Bill Monroe - the rest is Techno, Dance, House, Electronic, Yanni (I like), Sarah McLachlann (sp). Now, wife said sound leakage is a problem. I had a pair of Grado Sr80i and they had to go because of that. My choices are Sennheiser HD650, PSB m4u2, HIFIman HE500 (dependent on the kidney bake sale. A bit out of my range, but I will beg like a mad dog.) and the closed backs AT W1000 cans. Sound leakage is a no, but in the end, I would like the cans with the best sonic characteristics for my needs with that budget. Please be angels again and save my hide. HIFIman would be my first choice. Thanks again for all the help and sorry for the lengthy first post.