The bottom-of-the-line Grado SR60's are quite affordable (something like $70) and are] traditional band-over-the-top headphones. The band is flexible, so you can expand or shrink it to make it more comfortable on your head. Sound quality is fantastic. The only downside is that they're (relatively) open air, so outside noise gets in easily. I never had complaints from nearby people about the sound from my headphones when I was using them.