Ok, I'm looking for suggestions for a Headphone rig (desktop) to listen to music. I'm mostly into Jazz, R&B, Rock, Metal, pretty much anything that doesn't involve Hip Hop (dunno why I loathe it, but I do). So, the sound signature has to be awesome with Acoustic, voices, and instruments. I would like Tube, but doesn't have to be. My budget is around $500. If anyone has suggestions, I'd greatly appreciate anything you can offer.