I'm not familiar with Fuji's high-end cameras, but I do have one of their 2800z's and if you have a 4800z, you know they they give you a lot for a good price.
I recently switched to a Cannon Rebel XTi and I love it. Easy to use, excellent picture quality and a great assortment of lenses from Canon and third parties. I mostly use a Sigma 28-300mm and it covers just about every shooting situation. All of my RCU Event coverage is shot with it.
My Partner Ken uses a Nikon (Not sure which model, but I am waiting his reply)
If you look at this article:
http://www.rcuniverse.com/magazine/a...rticle_id=1026
All of the Heli pics were shot with my Canon and all of the airplane pics were shot with Ken's Nikon