[secrrr]

hi-fi: i don't know.

studio/audiophile: http://www.beyerdynamic.de/shop/hah/headphones-and-headsets/... A little weak in the heights, and no hi-fi (no exaggerated subs). But really good for the money. Also available in half closed. With this clear and neutral sound you will begin to hear youtube compression and bad mixes though :) Also look for the ohms, they need quite some power.

If you prefer a more roomy sound I'd go for studio AKGs, but for a clean sound it might need a little more than your budget here.