I just stepped up from a K240 MKII to an HD650. It's a pretty awesome. So awesome that I'm starting to hear little blemishes or colorations in the music that I hadn't heard before. Do you guys have any suggestions of any albums/artists that happen to be particularly well mastered and balanced that can really bring out a pair of good headphones? Or are there any forums/sites/communities, etc, that focus on high quality music out there?