[michaelochurch]

I wouldn't limit myself to one language or framework, in reality.

Growing very fast? Python, with C for high-performance components. Python's got great libraries for everything, and hiring Python and C programmers wouldn't be hard because those languages have a lot of users.

Growing typically fast? Clojure. Drop to Java if needed for extremely high performance demands, or if I need to hire fast.

Growing at a leisurely pace? I'd be tempted to try Haskell (and possibly switch to Clojure). It's badass, it'd be fun to learn, and some of the smartest people I know are big fans of it. However, with the "leisurely pace" (R&D) I'd be tempted to hire people only as smart as I am and let them use whatever they wanted.