If you were really going to be serious about seaplanes, I think you'd start with the PBY as it was used by RAF, RAAF, RNZAF, USAAF etc all over the place. I think the Rufe would also be top of the list as they did get used all over the Pacific from the Aluetians to New Guiniea. The Rufe is half done as is, with the new Zero modeling

Another of those down the list things, but I think if I had to start somewhere, that's where it would be. Just my opinion of course