AKG K271s is very good and with a better seal than the Beyer DT 250's. The Beyer's might be more neutral but I like the 271s better for some reason. I thought the Senn HD280 was dreadful, sterile sounding, felt like my head was in a clamp and starting sweating around the ears immediately. Beyer has the new DT770 with soft fabric cups that is sealed but according to some lacking in the mids or has tipped up highs and lows. If you don't need sealed cans, the Senn HD650's are the most revealing, ultra resolving cans I have ever heard and they can be had for around $300. I cannot listen to a lot of the old 50's jazz recordings on these cans becuase they let you hear too far into the sound, warts and all, tape hiss, sharps and flats, wows and flutters, etc. If you want brutally revealing open cans that let you hear everything on the tape or hard drive as it were, the 650's are it.