Well, if you're looking for something cheap but not as "dumb" as FS, you might want to take a closer look at X-Plane (Win/Mac).
It's far less expensive than ELITE and Jepp (60$ + shipping) and all the algorithms stuffed in it make it much more "real" than FS. I've been amazed by what you can do with this sim.
http://www.x-plane.com/