I think the AKG K701 and Beyer DT880 are way on the bright side of neutral, while the HD650 is more natural sounding. To each his own.
Edit: Although I must say, the most neutral headphone I've heard (and I know many will argue with me on this) is the HD800. Even against the T1 and HE500.
Edited by calipilot227 - 12/1/13 at 8:18pm