I have a CODA #16 and owned a CODA 07x preamp. I ended up with the Benchmark HPA4 (or LA4) preamp and the Holo Audio Serene preamp. Either preamp works great with the #16, with slight sonic differences. My DAC is the Schitt Yggi+ OG.
I recently heard the new SimAudio 791 preamp/DAC/ethernet streamer and while very good and extremely convenient. I had no desire to change out my preamp or DAC (and fibre optic streaming) for the much costlier 791.