Looking for some (cheap) Chi-fi IEMs with a warm sound signature. I already got the KZ ES3 today but they a bit too hot in the highs for my taste. Any recommendations?

Hey guys,   just got my 990s yesterday and they really sound amazing, really a step-up from my qpad qh-90s. Atm i'm powering them with my creative soundblaster z soundcard and it powers them louder than my ears could handle so that's not a problem. But im just curious if an amp would do...