I want to get a Yak for my Brillelli 46cc gas engine, but not sure which is the best fit. I know EF has a 77", Somenzini has a 73" and 85" and I think there are a few others.

Which will be the best fit for my engine and be 3D capable?

Definitely not the 85" or 87" ers put there.

Wild Hare has an 80in Yak....under 14lbs is what you will need to have spirited 3D, IMO.

the 72 -74 in'ers will be too small.

WildHare 80" or the Goldberg 77"

I have the Goldberg with a Brison 2.4 - great performance, but I do have a Brillelli 46 on the way that I'm thinking about putting in the Yak and using my Brison elsewhere.

How is the quality of the Goldberg model? I had an EF 68" Yak and it was the best plane I ever flew so I know what to expect with EF. And I have heard nothing but good about the QQ models.

Does the Goldberg have any bad habits?

I think it's a very well built plane - flies nicely. I'm not a 3d-aholic, and I'm just getting my first dozen flights on mine, but it's very well built. It's not the super-lightweight build that a EF or QQ yak is going to be, but those planes are going to be heavier due to their size. I would estimate that with the same electronics the Wildhare would either equal the Goldberg, or maybe weigh a little less.

I'm still in the trimming and tweaking stage on mine - I need to reduce some throws for more of a locked-in pattern/precision feel - with the increased throws I have it's very quick to respond to aileron and elevator throws, and the Rudder is massive, tons of authority. It does a very impressive knife edge spin - so impressive I almost kept it locked in too long and didn't get pulled out in time.

I'll put mine together tonight and weigh it on a digital scale - mind you I haven't taken any weight saving measures on it. No carbon, I'm running a spinner and wheelpants. 2700mah RX NiMH, I even have to use a reversing adapter for my elevator servos (Futaba 7C doesnt have dual elevator trim programming) I am only using one servo per wing panel - it is built for dual servos per wing half (so that a buyer could use dual standard servos instead of a single high-torque.)

Oh, and the EF Yak is a 74" now, not 77". Brillelli is actually running a package deal that bundles the 46cc and the EF 74" yak and some accessories for $900 I think.

I think it is down to the 74" EF or 73" QQ. I have heard nothing bad about either.

Is either one more durable? I fly off grass so if one can handle that better, that would be my decision maker.

There are some pretty dedicated threads on RCU about both - generally in the 3D forum. Look for the one on the QQ yak started by Aerobob - he did a build on that one with the Brillelli 40. Per Brillelli the 46 is more powerful, but only about 3-4 ounces more with the new muffler on it. Bob even has some video posted so you can see how the engine pulls the plane. Although he has a dead-stick that turns into a dead-yak.