I used to use 'flat' headphones, which is typical with most 'mixing' headphones, but people don't listen to music 'flat.' They usually listen with a slight V shape (sometimes more if they like a lot of bass, etc.). In other words, a slight push of bass and treble with the midrange slightly depressed. I sold my studio headphones for the Meze Classic 99s (a company out of Romania if you're not familiar with them). They're about $300 USD. They have a pair that are $3k USD, which are supposed to be amazing (they better be), but I'm not willing to pay that much. In any case, I can mix with those and when I play them through a regular set of speakers or system, I'm able to dial in pretty well, and better than with flat monitoring headphones.