Sennheiser Circumaural (Silver)

Pros: Very lightweight and comfortable. Can wear it for hours on end.
Good sound quality. I'm no audiophile but the sounds are very clear and crisp to my ears.
Earcups provide a good seal to prevent most noise from filtering in.

Cons: The bass isn't as deep as I would like but that's only a minor point since equalisers can change that.
An in-line volume control would have been much appreciated.

Summary: Got these for AU$35 and I'm loving it. The sound quality is much better than what you would expect and the build quality is pretty good. Yes, it's plastic but that's why it's also very light.
However, people who prefer the really deep, booming bass might not like these.