Chord DAVE is an excellent preamp. It has remote volume control and multiple digital inputs. RCA and balanced outputs. I use it as my preamp.
I can’t agree with those of you who think a preamp adds to the quality of the sound. Touching the signal can only degrade it. the less you touch it, the more intact it stays.
Edit: Just noticed your budget. The chord Qutest will work as a preamp I think. I've borrowed one and used it but don't remember how I controlled volume.
--Jerry