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I have a pair of Shure E2C's that I really like, though I'm not much of an audiophile.

I own many headphones. I agree Sennheisers are a great place to start. The ones I own in your price range are the Sennheiser HD555 and Grado SD60.

The Sennheiser HD555 are awesome for the price. Like all Sennheiser, I think they are the extremely comfortable and deliver a clear, warm, consistent sound.

I also recommend the Grado SD 60. Not known for their comfort, but known for the open-air design which gives a more clearer, sparkly sound then the Sennheisers.

I agree with danzo, Grado SD 60's are great sound for the price. You can find others here: www.headfi.org It's a great resource for anything related to headphones. Might have to do a little trolling through the forum, but you'll find everything you need there.

You could step up to the Grado SR80s for $100. It really depends on whether you want open or sealed. Open sounds better in almost all cases, but will bother people around you and don't block out external sound much. Sealed phones block out quite a bit and don't bother people around you, but don't sound quite as spacious and detailed. I have a pair of each: Sennheiser HD212s ($60) for planes and trains and Grado SR125s for home use.
Take a look at www.headphone.com. Great reviews for all the cans they sell.