Didn't know you had been there but since you have just buy one of the refurb MicroRendu's with the iPower with the MP-D2 and you are still close or just look in another direction like the Amber II. Also not sure what you mean about too much computer interfacing. If you transfer your music files to the streamers internal HD then the server/NAS is out of the equation altogether.
Thanks for any recommendations that could allow this solution to work. And good point, to a degree. Yes, I could pick up a discounted MicroRendu, but the iPower is not capable of allowing the MicroRendu to produce anything close to optimal sound. The minimum cost I know of for a usable power supply is $400.00 (and that one, the Uptone LPS-1 is a steal, and back ordered). So, unfortunately, adding up everything, you are looking at close to $900.00 for the MicroRendu and power supply, and then the cost of the MP-D2 with necessary options. So, probably $2300-2500.00 total, and I started this with a $1500.00 max budget.
As far as the question about interfacing with servers/computers, etc, there is no internal HD that exists in the system. All of my music files are on a NAS. And it's already 80% full at 4TB.
JC