Sounds like fun!
I'm thinking Lattice, and QMC have a relatively strong team presence already, are close to "production" status, and are accepting new accounts (Malaria has turned off account creation) -- they might be good starting points. I could be tempted by Leiden too. It is also close to or in production status, and falling between QMC's 17k users and Lattice's 1k, we could probably drive up the ranks there.
Don't get me wrong, I'd do CPDN or Einstein in a heartbeat, but at least CPDN might be tough for some members.
I was surprised to see how many of us were crunching Tanpaku, SIMAP, Proteins and Predictor. Anyone want to make a case for them?