RE: Goldberg EXTRA vs. GP EXTRA .60 ?
I agree with Flyboy. A friend I respected greatly built the goldberg one. Put a 61 in it. It could barely get out of it's own way. flew poorly. put a Supertiger 90 in it. Flew great, looked great also. But he was a superlative builder. Get the Goldberg and your 90 and have fun.
mark Shuman