i've used a SP B1 as an overhead before and i like the sound i've gotten out of it. *not* a big fan of the B1 on vocals.....only had 1 vocalist where it was the "right" mic.
the B1 has got a different sound than the V67, which i think makes them a good pairing for OHs......at least, on my kit. obviously, i'm not that concerned about using matching mics, or even mics of the same kind, as overheads. there's something to be said for that--if one part of the kit has different frequency/timbre requirements than the other, then why not match your mics to that? of course, i've never been one to follow rules much, and if i think it sounds good, regardless of source, i'll go with it.
still, i need to pick up a pair of mc012's......
cheers,
wade