I can't claim to have heard all the options suggested here, but there is one that I have a lot of experience with that has been previously mentioned. The Aurender N100 is slightly above your budget new, and like well within your budget used. About two years ago, I demoed it against a MacBook Pro with an iFi reclocker and Audioquest Carbn cable. it took less than a minute to determine that completely smoked the MacBook Pro/iFi setup. Not even close. I was pretty shocked. I also bought the N100. Was completely happy with it until a made a big mistake. About a year after the purchase, I heard it compared to an Aurender N10. My checkbook cried, but I upgraded. As long as you don't listen to one of the megabuck streamers, I would expect you to be very happy with the N100. I still don't understand what makes the Aurender units sound so good, but clearly there is more to the story than 'bits-are-bits'. And the Conductor app is quite good also.
Waht is the best streamer for the money under $2500 (no DAC or storage required).
I've got my sights on a Simiaudio Moon 2, auralic aries G1 and a Lumin. Trying to stay below $2500 used or new. I've heard great things about all, but the dealer who sells dozesn of highend gear is pusing hard towards the Moon 2. I'm pairing the streamer with McIntosh MHA 100 headpone AMP. Anyone have suggestions on these three or a comparable 4th or 5th option to consider? Thanks.