Call FW customer service and they will tell you the factory prop for the boat/motor/drive combo you have.
Basically you want to prop the boat with a prop that will allow your engine to fall within the WOT rpms for that engine.
If you over or under prop you can put the engine onder a load that will shorten it's life.
I would suggest that if you are going to purchase a new prop that you look into the Huslter line from TurningPoint. They have a Prop/Hub system. Once you buy the hub, you can easily change props. I purchase a prop and hub for $99. Additional props are about $70-$75. This way you can use the prop for the boat that allows you to run in the WOT range but could change to a different prop that is better for watersports when needed.
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Jvalich
http://www.badcock.com'04 FW 288 Vista "Mental Floss"