for earphones, you can try UE 5 pro or if you have more $ to spend then 10pro. highs are so much clearer on 10pro. that said, better to try out. i still prefer 5pro over 10pro. if you wan something cheap..and good...try the crossroads X3s....very very good for its price.
for portable amps...i have practical XM4 and RSA tomahawk. tomahawk is great but cost much more. XM4 is great too but cost half of tomahawk.
also tried the millet hybrid. its a tube amp thata sounds wonderful. but its a bit sensitive to movement...cause a ringing sound when there is too much movement.
if you are looking for a portable speaker( can be battery powered). the harman/kardon play+go is wonderful. very very good sound for the price.