RE: tiger 2
In my opinion, after 20 years of float flying with everything from trainers to pattern ships, electrics to gas, I would say that the Tiger 2 is the best all around float plane there is.
It is light, so you don't need big floats (32" work the best) and the weight of the floats won't hurt performance.
The tail area is large so you don't have to add a ventral fin for good tracking.
The air rudder is big enough that you don't need a water rudder.
The low wing means it won't blow over in a crosswind.
The fully symmetrical airfoil helps make it neutrally stable, even with floats, so your aerobatics won't suffer. (Inverted and knife edge maneuvers are actually easier to do with the floats on.)
It is small enough to transport easily, but big enough for good smooth flight performance.
A cheap engine and cheap servos work great so you don't have to worry about dunking expensive gear.
Do it! You won't be sorry!
Jim