What you need, is nothing more than 1/4" diameter. What feels good in your hand is up to you and your crew. I use line from 7/64th to 3/8th on my 25 footer, but most of that has to do with low stretch and low weight. If you're not concerned with that, then buy a spool of 3/8th sta-set and be done with it. Use it for the whole boat. Not a great line, but it works.
Merit 25 # 764 "Audrey"