Ugh. I just got rid of my Bass Buddy and got a GK MB200, because I wanted something that size with power. The Bass Buddy is maybe the most versatile and useful piece of equipment on the market.
I assume the B-200 is just the power amp section from the D-200? Although it looks like it has a instrument input too so you can run it direct? Interesting. I have a D-200 and love it's pre-amp but it's output is what I would call modest at best.