Sennheiser. Very smooth...yes, expennsive. but well made, super comfortable, uniformly reliable. i find the sony mdr6 uneven for some reason, or not smooth...something.
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I have the Sony MDR-V6's on your list and I have enjoyed them with the headphone jack from my Outlaw Model 990 and from the headphone jack of my Dell laptop at work. They are a very neutral sounding headphone. Bass and treble were just right to me.
Here is an old review from an A'gon member about the pro version of the MDR-V6. The Sony MDR 7506. They are practically the same.
Now regarding comfort I say swap out the stock pads from the MDR-V6 for the velour padded Earcushions for the BeyerDynamic DT250/DT280. When I wear the V6's with the stock earpads my ears perspire even after only an hour of listening to music. Also I wouldn't get the Pearpad ear cushions for the V6s. In my case they changed the MDR-V6 from an over the ear to an on-ear headphone which was not comfortable for me.
Also check youtube for reviews on the MDR V6.
Best of luck with your search.