If you're looking for big, expensive, over-the-ear headphones, or anything in between, anything with the name AKG on it will kick ass. Sennheisers are nice, but a little hit or miss depending on the model, and I prefer the sound of AKGs. The Sennheiser ear canal buds are pretty decent too.
(can you tell I do this for a living?
The other day I had to try out every single set of headphones my store sells...nothing beats $350 AKGs)