Sailmakers?
We can't tell your location from the posts, but I'm a great believer in dealing with local sailmakers. On the Chesapeake, there are lots of sailmakers and lofts to choose from. You can describe what kind of sailing, what wind strengths, how long the sail should last, how much crew work,and of course, how much money you'd care to spend. Of course you may get something cheaper from the far east or un-seen off the shelf on-line, but why not talk to your local expert(s) possibly with references from others in your sailing group. If you are in the northern end of Chesaeake Bay, I'd absolutely recommend Ulmer-Skelley Sails in Havre DeGrace, MD.My personal choice, depending on the sails you already have would be a fairly large Genoa,say 150-155% beacuse you will use it upwind, reaching and on a run and it will be heavier longer lasting, more forgiving in gusts and more easily handled than an A-Kite, particularly on a roller furler.