Looking for a preamp used under 5k

Hello, I'm new to this hobby.  I'm looking for a preamp to pair with my BAT REX amp.  I have a Dynaudio Contour 5.4s, Oppo Sonica,  Mostly stream from Tidal listening to vocal.  I do have a Oppo 205, which I can use as a preamp, but not sure if I should keep it or sell it to get an preamp.  Any suggestion is greatly appreciated.