Kemonophonic said:
Once you go high-end there's no going back. I had the entire audio system in my car upgraded a while ago and ever since then every other car I ride in the stereo sounds like shit in comparison.

I have a FiiO USB amp and Sennheiser HD559s. (I ordered used HD599s and guess what arrived. They were meant to replace an ancient pair of 598s that broke.) High quality audio rules.