Aeroworks planes always come out SO HEAVY that I'm not sure if it's worth it. The Mojo 60 has more wing area and it's rated 1.5lbs lighter....and Mojo's come out on par for weight where as you have to FIGHT to get Aeroworks planes to come out at their advertised weight. Money says that the Mojo 60 will weigh 5.5 while the AW PROX260 will weigh 7-7.5 lbs. In fact, their full-fuse Extra 260 and Yak 54 come out to 7.5lbs.

Also, your Saito 100 will simply NOT fly the Yak90 well. It may be able to handle the Yak60, but with similar performance to the way your Edge flew.