I had lunch with a few of the Nats reporters last month and this topic came up. Everybody had a different answer to the question, but they predicted that Roark would move to the pen because he is a legitimate team-first guy and 3 of the other guys would pout and/or make a fuss about it. The fact he has bullpen experience makes it easier to justify the move.

I think your order is pretty solid. If the series starts at home, I'd be inclined start Strasburg based on how well he has pitched at home.