I would suggest the DMP-A6 (not the A6 ME, nor the A8) as a server. Used should be fine. All three are essentially the same server, although the A8 does have an upgraded power supply, but I doubt most of us could pick out the better one in an A/B test. I found the quality of the server to be great. The DAC portion, with all the various adjustable attributes, is a decent fall back DAC. Find a DAC that you truly like to pair with it.
This option gives you a decent streamer with an amazing app that makes streaming FUN. The SSD option also allows you to load your CDs and play them on the streamer. The DAC is the area with the greatest opportunity for future improvement. Keeping it as a separate gives you options.