The is a great book out on propellers that you can buy from Amazon.com for around $14 bucks.. cheap at twice that price if it saves you from buying a $500 mistake.
It's called "The Propeller Handbook" by Dave Gerr
A must read for anyone contemplating buying a new propeller! In fact, you can even read several dozen of the pages by going to Amazon and clicking on the book and then clicking on the "See inside" tab.. or you can simply click on this link to get to the same place:
http://www.amazon.com/Propeller-Hand...der_0071381767
Although you cannot read the whole book, there are enough pages that are displayed for free to give you a really good idea of what you should be looking for and why things work like they do when it comes to propellers. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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