try ClearView - it is low cost but good
I second that. It is only $30 bucks which is almost free, is way better than FMS IMHO and the support is second to none.
Just to be fair, I have never tried any of the more expensive ones but so far haven't needed to.
I didn't like FMS all that much and never seemed to get around to using it.
Once I got ClearView I actually started spending time on the simulator and it is really helping.
I still suck but am getting better