I had the B2RE for over a decade, bought new around 2003, I believe. It was... fine. I used it with a 4ohm Ampeg 410 HLF cab. Worked fine the entire time, and while I had no solid complaints, I also never really loved it. It just... sounded. Not great, not bad. I too play at church, a bigger church when I lived closer to Nashville, and now a smaller church. I never needed more power than the amp gave me.
However, I've gotten newer amps since and have gotten a lot more character and satisfaction. I still use the same speaker cab most of the time.
I say all of that to end with this... you won't go WRONG with the B2 series... but you may not be enthralled with it, either. Finding a good deal on one will remove the sting if you change your mind and end up reselling in the future. Happy bass playing!