I'm of the mind Werthless bats leadoff or second. Spots 3-6 need to be our power guys - Zim, Morse, LaRoche, and Espinosa. Ideally this would be my lineup (assuming we landed Jones):
Werthless
Jones
Zim
Morse
LaRoche
Espinosa
Ramos
Pitcher
Desmond
Probably a terrible lineup based on some faulty "model", but I could see it being productive.
I'd argue that Werth is as much of a power guy as LaRoche. Werth's career HR rate is 3.9 versus LaRoche's 4.1.
I checked it with a model out of curiosity... for Werth and Zimmerman, I used an average of last year and their career averages, for LaRoche I used 2010, for a pitcher I used .140/.200 for OBP/SLG, and for everyone else, I used their 2011 numbers. The best lineup, yielding an average of 4.646 runs a game (as opposed to the average 4.589), is the following:
1. Jayson Werth
2. Ryan Zimmerman
3. Danny Espinosa
4. Michael Morse
5. Wilson Ramos
6. Adam Jones
7. Adam LaRoche
8. Pitcher
9. Ian Desmond
Not far off from your own projections. I think it puts Jones lower than you do because of his low OBP. I was surprised at Ramos at #5, but he did hit better than Jones last year. Only significant difference is Espinosa at #3.
The difference between the average lineup and the optimal lineup (per the model) is 0.057 runs per game, or 9.234 runs over a 162 game season, or 0.9234 wins. Basically, the best lineup versus the average lineup is an extra win over the course of a season.