I too think the Saito 180 will fly the WM 80" Extra just fine. These days, the buzz words are "unlimited verticals". It seems that if a planes doesn't pull out of hover at 1/2 throttle, it ain't worth didley. That is just not true.

If you don't care to 3D or compete in freestyle, there is nothing wrong with this combo. About the only problem you might encounter is balancing the model properly with such a lightweight engine up front.