I'm biased, but really like the AKG k271 studio. They are fairly lightweight and very confortable (unless you have big ears) and very natural in the mids, and smooth non fatiguing highs. Bass is not excessive but adequate for most styles of music when listening in a hi-fi context. Works particulary well for music with more detail. Acoustic guitar and piano, as well as female vox shine with these. Stuff like Mars Volta can push them overboard without a good amp behind them. They're perfect for studio tracking too since the mids are the most prominent and the bass doesn't mask any details by being too hyped. Require good amping, as they're not highly efficient.
They however,do use leather pads. Which do get hot/sweaty after a while, especially if you live somewhere warm/humid. Som people (jncluding myself) have bought the Beyer DT770 pads which can fit on the k271 with some force, however they do reduce a lot of mid clarity which make the cans unique. They also reduce soundstage and create an uncomfortable phasing tunnel effect. Apparently AKG are releasing their own velour pads soon. Curuious to see how they sound.
Other recommendations include the DT770's. Top and bottom end is superb. Mids are a bit recessed for my tastes. Good engaging hifi phones, especially for rock or bass-heavy beat-style music. Also top for games. Easier to drive than the AKGs.