I was originally planing to get a Xonar Essence STX with Ultrasone Pro 750, but Dacs and Amps is something I'm not familiar with, and the more i looked around here and else where the more i wondered if this was the best way to spend my money. Now I'm not opposed to the Ultrasones(not set on them...

I'm looking to replace my HD 555's that have been buggered for awhile now. My budget is around 300$, I'm flexible though.   I'll be using them for Music (Mostly Electronic, but pretty much everything else) Movies, and Games (RPGS/RTS). I don't have a preference between open or closed, But...