Fewski,
Go with the 46, as stated the AX, FX or older SF would be a good choice, if your going with a O.S, I would try to stay away from the LA as it's a bit underpowered. I hope you are going to get some instruction of some kind especially since your going to fly off water, flying off land is difficult for a beginner, but flying off water is even harder, I'd hate to see your nice new plane turn into a submarine.