Dave, I like your number of 200 people. If someone asks "why 200?" maybe you're aware of this already, but here is something from Malcom Gladwell's book The Tipping Point. This is a passage from a review of that book I posted on Goodreads:

He [Gladwell] talks about 'channel capacity' and the theory from anthropologists and sociologists that 150 people seem to be the maximum for a viable social network. That theory has even been applied to factory settings. The Gore-Tex fabric manufacturer in Delaware built three separate factories with about 150 employees each, rather than one big one.