[BalletJH]

Hi guys. I am using CTM CT200 CIEM and iPhone 4s and Sansa clip+ as my DACs. I just want to improve the SQ of my equipment. I was wondering if I need an amp or should I possibly get a better DAC first? Or should I even consider some of the all-in-one solutions. My budget is < $500. SQ is my prior concern here, portability does not matter. I listen to pop music. 
 
Here is the specifications of my CIEM:
https://cleartunemonitors.com/ct-200/
 
 
Thanks guys!!