I recently acquired a set of DT 880s (250 ohms) and bought a Fiio A5 to drive them. While I like the combo, I was wondering if I should have tried out other amps namely, the Cayin C5, Topping NX5 and maybe the Aune B1 which is a little above the price range I am looking at, before I made the jump. The A5 is a great amp but I find the bass (even with the boost) and the soundstage a little bit lacking. What other amps should I be looking at in the sub $200 price range? Looking mostly at amps and I do not want a DAC at the moment. PS : Portability is a must for me.