Skylab, you should definitely try the MK IV SE and the MK I. LD keeps getting better. My MK IV SE has been burning in (along with my K-701s) at 50% volume for over 50 hours. Even with the stock tubes, I hear a well balanced sound including a good bass (not punchy or overwhelming) presence, even with the AKGs.
But 50 hours of the Lord of the Rings soundtracks (the first two being the complete recordings) can drive you crazy being in the same room (no, I wasn't wearing the headphones).
I know you have been mostly dealing with portable goodies, but it might be refreshing to those wanting (looking) for desktop goodies to hear your impressions as well. What do you think? X2 what -HK sends.