Howdy. About to start traveling again, and need to get new portable headphones and possibly an amp. I think I've decided on the Sennheiser HD25-1 II 'phones (though I'm interested in other recommendations for on- or over-ears—not buds or IEMS— in that general price range or below), but am wondering what a good portable amp might be. I have a FiiO E11, but would be grateful for any suggestions for other options in the $100ish price range.
Thanks in advance for your input.