RE: fusion?
I didn't mention this in my last post, but I think the fusion flies a little better at the heavier weight. It cuts through the wind a better. Mike at OMP said the same thing. His prototype was about 7.5lbs. The first kits were coming in at around 7lbs, and he said he actually liked it better at 7.5.
Go ahead and go with the 120. It will do great.