Kind Sail -
How do you store your current sails? If you don't flake them, or better, roll them, then leave all the 3DL and string sails alone.
Do you have a furler? If so, just use dacron.
You should do fine with a #1 and #3. Which is usually a 155% and a 100%. That'll take you to 30 kts, and you really don't want to be out in much higher for pleasure sailing anyway.
If you plan on racing, talk to the Q loft. I've bought 3 sails from them and have been pleased with their products.
Merit 25 # 764 "Audrey"