You'll find if you get massive studio type ones, they take a lot more to be powered by your computer/MP3 player, etc, so they have to be turned up a lot louder to get the same response from a smaller pair. This is to do with the resistance.
I have a lovely pair of Senheiser PX100's, and love them.
The bass is crisp and punchy, the mids excellent, and the highs, as they should be.
I've had them for around a year and a half, and even though they are light/fold up, they haven't broken on me yet, so the qualities pretty amazing on the build too.
Only nag is that they don't cover sound very well, so people can here your music if set too loud, and you can still hear surroundings.
There is a version above the ones I have though, which have cushions that do block sound, but one thing about these headphones that I like, is the openness of the sound. Something that you get less off with closed ear cup versions.
Abit IP35 Pro / Q6600 G0 / Zalman 9700 / 8800GTS 640mb / 4x 2GB Corsair XMS / X-FI Xtreme M / 1x 1TB / Antec 900 / Logitech Z-5500 / Samsung 20inch