I wear headphones very frequently and have about a dozen pair. I've tried a bunch of different earbuds but here's what I can say about over ears:

Grado iGrado: My favorite general use pair. The sound very good, are fairly light, have a behind-the-head fit. I have them in black. The only thing I don't like is the chrome finish on the sides. I'd definitely buy them again (I got mine from AudioAdvisor for about $50). I hope Grado comes out with an earbud.

Grado S-80s: I love the sound of these (the best of what I have experienced). Put them on and you look like you just stepped out of the soundbooth from recording some tracks by some young kids calling themselves "the Beatles". They are bulky, they have a lengthy, thick, and somewhat inflexible cord. I wear them whenever I want to really enjoy listening to something but after about an hour I have to take them off because my ears are sweaty.

Bose QC2: A gift from my father-in-law for flying. They don't sound as good as good as the Grados 80s. I'm not entirely sold on the "noise-reducing" aspect. Not all that comfortable to me and larger than I like to try to carry along. I usually end up using my Shure e2cs instead (with the silicone tips) because once they are in, the ear seal seems to work better than the Bose circuitry.