I pair a JDS-Lab_Atom DAC to a Van Alstine Transcendence RB 10 preamp. The JDS is well-rated on ASR, is inexpensive, and sounds better than the DAC built into a HEOS2 box, for example.
I put the money into the Van Alstine. It is moderately expensive (that is, economical by audiophile standards 😉) and has proved to be an accurate and musical tube preamp.