tl;dr - looking for help.
Hi, my father recently forgot a pair of Senn HD25's in a hotel, so he needs a replacement. He absolutely loved the sound form my AKG K141 MKII's, even when driven from his iPod Nano 5th gen, and these headphones, despite their low impedance, are not the easiest to drive. I would look for a pair of those, but he travels a great deal so portability and isolation are factors to take into consideration.
So in summation, I am looking for a pair of supra-aural headphones that are portable, easy to drive, with a decent mids/his, and that isolate pretty well. I'm looking to spend ~$130, and have no issue going to the used market.
He listens to largely classical, namely orchestral, music, and a fair share of 60's to late 70's rock and pop. (The Beatles, The Who, Creedance, Floyd, Jethro Tull, Beach Boys etc....)
Thanks ahead for any assistance.