Thanks. I see what you guys mean relative to the types of headphones. I'm a bit reluctant to spend larger dollars on those mini phones given I have never heard a pair. I'm sure they sound great but I would have to hear them to believe them.
Concerning music types, it's a tough one. I tend to be faithful to record labels and my favorites are blue note (jazz), OJC (jazz), hatART (modern jazz), FMP (free jazz), Matador (rock), Drag City (rock), and Erstwhile (electro-acoustic/noise/electronic).
Concerning amps, I built the Mapletree Ear+ a few years ago.