Looking at the CH750 which is a little heavier built than the Savannah range. Engine would be O-200 or Rotax 912 or possibly 914 with an airmaster constant speed prop.
Busy thinking about getting current again since the last Six months have been building, fitting out, and racing a sports boat.
The costs of the sports boat and an aircraft are about the same once you start adding in carbon mast, Sails, etc.