I own some very nice headphones, including a pair of Sennheiser HD650s, but spend 98 percent of my time with Koss PortaPros. Not a fan of audiophile terms, so I'll leave it at they sound right to me, and if they break, the max I'm out is $40. (Plus Koss offers a generous lietime warranty.)

The only thing thing they're not good at it blocking out noise, which could be a deal breaker for you. But assuming you haven't spent your headphone budget already, buy these. They're worth it.