I like low BB for touring and commuting. I had a Schwinn Circuit converted to 26" wheels that had a 254mm BB and it was a little low, but I never hit a pedal with 170mm crank arms. 260-265 is the range I like as I can put a foot down at stops without leaving the saddle, the bike feels as if I am riding "in" it more than on, and it just seems more fun. I have a Bridgestone RB-2 converted to 650b that is right at 260 and it is great. Fendered and racked it is my commuter usually.
Good luck,
Tom Palmer
Twin Lake MI, were we have had 20" of snow since Monday.