Do a search here in the forums for the now out of production Walt Mucha Charger Mk II. It has a 60" span making it IMAA legal and will fly very nicely on a .90 size 4-stroke. The wing area is just over 1000 sq.'s so it's pretty easy to fly as well. If you can find one on the second hand market, they are worth the effort to build, though even that's not too tough. I built mine in 11 days.

John