Bill, I guess the first thing to decide is how big do you want to go. Your boat would probably do great with 12-20 hp. Several boats (4 I think) had the 28hp Kawasaki motor with a 42" Composite prop. I noticed that mine was the only one w/o a belt reduction.
Then look at this link,
http://www.arrowprop.com/
Once you're completely confused, Call their number and talk with Don. He has seen every type of set-up out there. and has more experience than anyone.