I have my yamaha2000, 2 batteries, 2 powermaxes and the outboard as far back as possible. That seems to offset the weight of a myself and a second shooter pretty well.
Mine would do 500# but whoever was on the deck had to be conscious of where they were stepping or I'd take water over the side...if you get it definitely invest in a big automatic bilge pump
And don't forget all the fish that everyone plans on shooting. But if your like me you don't have to worry about that many fish in the boat....