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Doug,
To piggy-back just a bit on Dave's response, if you pursue a 12" fixed two-blade prop, either a 7" or a 6" pitch should work well for you. The 7" pitch will perform nicely in calm wind and sea conditions, while the 6" pitch will have a slight edge in powering into heavier seas.
Also, I wouldn't give up too quickly on the Indigo prop. For its excellent performance, it is reported to have a rather modest amount of drag while sailing. In any case, it's rather difficult to reduce drag too much in a fixed blade prop, since the same design perimeters that provide good performance (especially in forward), also tend to produce drag. This is the reason avid racers usually go to a folding prop.
Best regards,
Don Moyer
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