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

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Gustard X20 Pro with USB - $869

Audio-GD NFB-1.38 (ES9038 Pro, Amanero & TCXO built in.).  Around $800-850 shipped to USA.

Audio-GD R2R 2 (if you want resistor ladder DAC) - Around $800-850 shipped to USA.

If the DAC is bought new, then you may have to run the DAC for about 100hours to burn in components (such as wire, capacitors, etc.).  This is a controversial subject (see shadorne's comment), but I have experienced burn-in many time.  The sound can change over the initial 100 hours until it settles.  The changes could be bad sounding at times (could be bright/harsh/messy).  It's up to you to decide on whether this is a real thing or not.