DAC purchase:new or used?


Hello. Getting in the digital realm.My budget is 1000 dollars for a DAC. Should I buy new or used? Looking more towards simpler DAC with less bells and whistles, but better components! if that makes sense. My system is very modest.
DAC will be used with Mac Book pro or Sony CDP-707 ESD , Yamaha AS-801 , Focal 836 W. 
Also, could someone explain the "burn in " time factor?
Thanks for taking the time.

rockanroller
I kinda agree with shadorne in that streaming audio can be very rewarding. Roon and Tidal can give you many, many options for enjoying music. There are a number of streamers with DACs and if you are wanting to explore MQA you must get one that will unfold and play those codecs (files). Some audio brands have decided to include a MQA decoding, many have not (including Schiit). Needless to say, even without MQA a well designed DAC will sound fantastic. I have gotten away from using my computer to play audio and use two dedicated digital music sources, my CD player with an external DAC and a Bluesound Node 2 for streaming and accesssing all my digital files on a NAS.
what don't you like about the DAC in your Yamaha? Some people have found that a DAC sounds better after a few hundred hours of use, clearly some do not...
Digital depreciates sharply buy  used and stretch your dollar further.  There are plenty of good options in your price range.