I would have to say the best sea plane I have flown is a piper cub by goldberg I think that it is the most versatile airplane for floats. I have flown them with 40and 60 2cycles and 70, 91 and 120 four cycles and would recommend a 70 or 91 in a four cycle but a 60 2 stroke would work fine. They will handle rougher water than most other sea planes and are very sturdy. If you can still get a kit for the plane and the floats It is a great combo
at far as the sea-master I think as long as it is a t tail it is OK
the old ones had a hard time getting off the water.

The Northstar Is also a great plane I have had one for 10 years and it has been a lot of fun but it is a fast plane I have had mine clocked at 125 MPH on radar I have a 91surpass with a pump and it is quiet I fly float planes allot and It is important to keep them quiet so the neighbors are not bothered
If you decide on either one of these feel free to send me a not and I will send you a list of good mods you can do


here are some pics of the cub and northstar (and a nice spruce goose )


http://www.rcgypsies.com/2001pics/index3c9a10a619.htm


RON