I'm thinking MDR-7506, MDR-V6 or HD-280 types for tracking - primarily guitar. Also, simply for playing my POD late at night... The word on the Sony's is that they are slightly scooped - or at least pronounced lows and highs. Critics of the Senns say they lack a little bass or have a mild mid-range honk. I'm looking for a great reference monitor headphone (in that price range) that will excel in guitar tracking... What say ye?