It seems the B3 is more popular around here.
I'd also recommend ditching the Coresound box. I had Chris Church rewire my 4061s so they can run off any 9v BB or a 9v preamp like the CA-9200. It'll give you more flexibility, better sound for quieter shows with cleaner gain from the pre, and not be subject to the wiring in the CS box getting messed up. I liked the fact that it had a locking connector and was hard metal, but it made them much less flexible for use. For example, with the setup I'm describing, you could run mics>extension cable>pre and not have to be right by the mics when you're rolling. With the CS setup the box is pretty close to the mics, only what, 3-4ft? Much harder to do unusual placements that way since you have to tape that box somewhere.