Imo the "best and undisputed" headphones by their popularity here on the head-fi "headphones" forum(of course from what *I* have seen, not by what factually is.) has to be the Beyerdynamic DT 770's and DT 880's, Grado SR60/80's, Sennheiser HD 650's, and AKG K701.
By far the best headphone I've ever had(and still have) is the Beyerdynamic DT 150. It has quality bass that really
thumps for electronic music - accurate and tuneful for more acoustic genres - while remaining under control at all times; a soundstage for all of the electronically produced sounds to float around in; and the hi-end detail that approaches that of the DT 880'03's. The DT 150's comfort draws no complaints from me, and I also have no worries about mistreating this headphone physically, because they are too toughly built to take any bs, ya know what I mean? This is by far the best all-around can I've ever been blessed with
The DT 150's beat all the cans listed above except for the HD 650, which I haven't heard(yet??).
imo the best bang-for-buck headphone has to be the Beyerdynamic DTX 900. Clean and fast bass, great mids and highs, and an awessssome soundstage. The 900's is a very comfortable headphone too, but its build quality can be a lot tougher.