Matt:

IMHO, the best choice of aircraft (particularly for someone new to seaplanes) is to go with a very conventional, low wing, sport type aircraft that has a lot of wing area, and a set of floats that are big enough, but not too big.

I don't know the weight of a G-20, but I imagine it isn't all that much more than a 120 four stroke. If that's the case, I highly recommend a Sig 4*120. You can either build the floats yourself or buy them from various suppliers.

I have a Sig 4*60 with FlyBaby floats (RCM plans) powered by a 91 FS and it is the sweetest flying, most forgiving airplane I've ever had. It is absolutely great on the water. I can also remove the floats, fold up the water rudder, and bolt the landing gear back on for grass fields. Note the mods to the tail- I added area to the vertical surface by extending it below the fuse. Essential for adding floats to an a/c not designed for them. I also took pains to keep water out of the bird- I used bellow seals on all the pushrods.

You can see a build thread on this a/c at:

http://www.rcuniverse.com/forum/m_44...tm.htm#4442961

By the way, it is not necessary to have a high mounted engine on a seaplane. A properly set up pair of floats keeps the engine high and dry. IMHO, high mounted engines are not worth the pitch trim problems associated with them.