I have a furling
150 and 120 for my H28.5. I tend to bend on and use the 120 at the beginning and end of the season here on the Chesapeake, and use the 150 during the middle part of the season (late June to mid-Sept). So if you have two furling sails, one of which is a 110, I'd go for the second sail being a 150 -- depending on the wind conditions in your area. If I only had one furling headsail, I'd probably choose a 135 per center. I do recommend that whatever size you choose, make sure it has a foam luff which will help keep its shape when you reef it. And, contrary ot popular opinion, I've found I can roll up the 150 to just about any size and still get decent performance when the wind is howling.