According to this tool, using 1959 - 2004 model, our best lineup (yielding 4.894 runs/game) based on 2010 OBA and slugging:
3. Sandoval or Ross
8. Ross or Sandoval
9. Bumgarner (our best hitting pitcher)
The lineup I entered yields 4.833 runs / game:
Huff hits first in every lineup they made. Two of the three second-place lineups it made up had Posey hitting second, and Burrell hitting cleanup.