Lots of wisdom here!
Go as big as you can afford. I'm underpowered with the Riptide 65 in my 18 foot flats. Also, factor your battery space (24 or 36). Other must haves:<UL><LI>Quick Release Bracket </LI><LI>Trolling Motor Plug (Male)</LI><LI>Trolling Motor Receptacle (Female)</LI><LI>On Board Charger</LI>[/list]
Take a look at pages 475, 476 and 494 in the 08 BPS Catalog.
Above all, listen to these guys.They know what they're talking about!