Looking for headphone amp/DAC


I am using Sony MDR-7506 headphones with my Apple iMac. I don't want to spend more than $150. I spend a lot of hours at my computer listening to music. I mostly listen to Hi Rez Qobuz. I am thinking of the the Zen Dac. Any thoughts about this
galleybob
Never heard the Z Dac but have owned an iFi Stereo 50  & can attest to them making a highly musical DAC with a super low noise floor that can really dig detail out without being harsh.For $150.00 I doubt you will find many that compete & certainly none that better it..
I prefer my Audioquest DragonFly Black (with Jitterbug) before my iFi nano. If you can go up in price the DragonFly Red is probably even better.
I use the Dragonfly Red and am very happy with it.  I tried the Jitterbug with it and transparency and soundstage were both negatively affected so i just use the Red on its own.  FWIW.