DAC Streamer Recommendation


A client of mine purchased a home in Colorado which included for free two mid 1970's Klipschorn K-Horns in perfect shape.  I am helping him assemble a system for the K-Horns.   I have purchased for him so far a Luxman L590aii amp and a VPI Prime Scout turntable with a Dynavector MC cartridge.  Although vinyl will be his prime source, he would also like to have the capability to stream hi-rez digital from Amazon. If the budget is $2000 for a streamer DAC, new or used, what should I look at?

I am a vinyl and SACD guy so I know nothing of this product.  Thanks for your help.
teeshot
I did not know that Amazon HD is a limiting factor. Ok let’s say Qobuz or Tidal are options.  His preference is for a one box solution if possible.  
Yeah, I’d ditch Amazon and go Qobuz, which is what I actually did and am very happy.  At that budget I’d get a Bluesound Node 2i streamer and an Audio Mirror Tubadour DAC lll.  That’d be a real nice start, and when funds allow he can upgrade the DAC to SE status and get a meaningful improvement if he wants.  If he’s serious at that point he’d probably also want to get a better streamer too.  Best of luck. 
If he likes vinyl (as I do), he should try Computer Audio Design. It sounds great. In Japan they are distributed by Stella (Techdas), and that says something to a vinyl lover...