Smokey, Make sure your sailmaker knows if you have single line reefing or not. That will limit the maximum amount of sail you can reef. I ordered a mainsail from Hyde for my 1994 Hunter 37.5 and did my own measurements, and I'm happy with the sail other than the second reef is to high for the capacity of the single line reefing system.
Is your single line system the type that has a shuttle in the boom, and that is limiting the travel? If not, then I'm not understanding how a single line system would differ from a 2-line system wrt the amount of sail one can reef.
For the OP: I didn't know fixed foot mains were even being made anymore. Go with the loose foot. There are no advantages with fixed foot - just disadvantages. Well, I guess if you want it to capture rain water, that might be an advantage.
The stackpack is a non-issue. I don't see how that would be any different for a loose foot than a fixed foot.
While brands of sails might have differences, for a dacron sail there will be larger differences between lofts of the same brand than between brands themselves. So choose a good loft. If you are getting a high tech sail, then the brands start to matter.
Mark
