The Sig Four Star 60 is a sweet, sweet flying plane. I have one matched up with a TT91RFS swinging an APC 14x6 prop and it's perfect. Aerobatics are easy and it'll do just about any manuever you ask it to. It goes where you point it, floats in nice and slow for landings and from what I can tell, doesn't have any bad tendencies. I'd recommend it in a heartbeat.

I haven't flown the Goldberg Tiger 60 but from what I understand, it's a nice flying plane as well. In fact, I think they were designed by the same designer, may be wrong though.

You would probably be fine with either one. The Tiger 60 has tricycle gear and the four star is a tail dragger.

Best of luck.