they cost a fuck lot.....how much do you want to spend....you can get away on the cheapend for id say about 350 with a pair of etymonic er-4's and custom inserts. ir you could go for a pair of canal phones, i have a pair of er-4p's with the triflaged tip and they fit fine. if you want to go on the more expensive end you can pick up a really nice pair for like 1k. if you want some more info or if i confused you really badly check out www.head-fi.org but i worn you, if you want to get good quality you will end up spending a lot