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.
128x128ninh1969
If brand new is fine with you, then I would highly recommend the Bakert Labs Rhumba 1.3. I recently acquired this and am very pleased with the performance and the quality. 
On AudioAsylum there's a NIB Atmasphere MP-3, I own one and it's wonderful. Just slightly more than you are looking to spend but at the asking price you can't go wrong.
The Bryston BP-17^3 is under $4K new for the bass model, and John Atkinson of Stereophile said that it’s hard to imagine anything else performing better. The Benchmark LA4 is also a serious contender.