I found great synergy with tube preamps and the Plinius SA-Reference. I am currently using my Ayon CD-5S as a tube preamp for them.
If the speakers you are considering aren't very sensitive, the ARC Reference should work too (I found that the combo of gain on the Plinius + my 90dB speakers too high to work well with the ARC but may consider using an inline attenuator that I was reading about).
Attenuators
Rothwell In-Line Attenuators by George Pappas