Berwick,
Sounds like your mainsail is similar to what I am ordering. I contracted with Ullman Sails in Virginia to build a cruising main with heavy cloth, three reefs, extra roach, reinforced clews, triple stitched, full battens, low friction slides. I don't have lazy jacks either and have debated, but the current arrangement seems to work fine. Are you going with a loose footed main? I decided to stick with the slides on the foot.
Hope the end product is everything I hope it'll be........this is obviously a major boat expenditure, but if it lasts 15 years....
Tom