Hello need help with recommendation for amp/dac.

Source : PC & zenfone 2
Hp : akg k612 pro. Will be receiving dt770 250ohm later this month
Requirement : portable & can be use as desktop amp
Budget : rm200-rm500

Note : chi fi amp/dac also be consider.
Edit : what you guys think about walnut v2/zishan z1. Is it a good amp/dap combo?
Thank you for your time reading this.

This post has been edited by kagokyousuke: Jun 17 2017, 07:07 PM