I had a BP25 that replaced a 12B and I was very happy with it. I only sold it because a new model had come out and having something even better was an exciting prospect. In my experience, all the Bryston stuff sounds good and with excellent speakers and especially excellent headphones, the improvements in each generation are very satisfying. It's more subtle with merely good speakers simply because the speaker anomalies will mask the differences between already good electronic components to a degree. Ultimately, if the BP20 is what you have budgeted for I think you will be happy with it.
I'll add that Chris Russell told some years ago that the really high quality electrolytic capacitors they use should sound good for 20 years. By that point, the rise in DA will make replacing them worthwhile and I highly recommend it. The sonic degradation is not subtle. It's experienced as a pronounced loss of clarity and is a real, measurable phenomenon. Bryston does this recapping for a modest charge and I wouldn't hesitate. I assume they will have an authorized shop near where you are but you would have to ask them.
