Hi guys, I despertly need an help. I'm looking for a budget headphones, 100 $ max (including amp if needed). I hear mostly classical music, mainly orchestral but some piano and vocal as well. In addition, it should have a fine isolation, since I listen to my music almost only in loudy buses. *portability is a bonus. I prefer a smaller, elegant headphones, and not a "big monster" ones. I had two options in mind, and will be glad to hear your opinions: 1. koss prodj100 + fioo E6 (not sure if the trebele on this is good enough for classic) 2. Sennheiser px 200 II (great in portability, not so sure about the isolation) Thank you!