Hey all, i read that the ESW9 does not need an amp, just wanted to know what portable amp will pair up nice with the headphones? $80 will be my budget as it's just for fun, considering the penguin amp don't know if it will be good PenguinAmp.com any advice will be nice

Hi all, this question might be asked a million times but need some help. I'm looking for good portable headphones, number one on the list is the Audio Technica ESW9 but have read mixed reviews good and bad. Living in Australia there's not many stores to choose from so, anyone out there...