You have a great plan… highly recommended. I also have a great analog rig and tried over the last nearly thirty years to get my digital end to near the same sound quality. Until about five years ago it really was not possible at any cost. It is now. By making careful choices you can reach the same sound quality for about the same investment. I now listen to vinyl about once every couple weeks, and have discovered a whole new world through streaming.
I recommend the N200. It is an outstanding streamer for the money. Given your scenario there is no reason to consider the A200 as the only difference is that it has an internal DAC. However, A200 adds a good DAC… but not a great DAC. In addition, it gives you the flexibility to upgrade individually.
I own two Aurrender streamers and am friends with a dealer who sells them, so have heard the A-series and also have his agreement on the subject.