The Morris the Knife is a very good 3D trainer. Have you been flying 3D at all, or are you new to it?

Morris has some deals on their ARFs now, you might want to check their site.

The Knife is a better flying plane than either Goldberg you mention, but of the two, the Edge is a bit better.

The Tufflight 4D is a whole different ball game. That plane really bounces. It is not as forgiving in the air as some, but is 10 times more forgiving when it argues with Terra Firma.

Good luck, and let us know what you decide.