RE: 2nd plane; low wing
Basically you're going to hear 2 responses out of the majority.
Goldberg Tiger 2
Sig 4*
Both are great second planes. The 4* starts out as a tail dragger. The Tiger 2 is a trike that can be converted to a tail dragger.
Both fly similar but I understand the 4* floats more.
I have a tiger 2 which I recently converted to a tail dragger. As far as I'm concerned it's a fantastic plane. I love every second of flying it!