I second Fokker. I've had good and not so good experiences at both institutions. FlightSafety may have held the crown at one point but either they got sloppy or just plain forgot that people have choices. Simuflite is cheaper on just about anything and last time I was at FSI TEB they preached about being aware that Brand X is moving "down the street." They have yet to put those words on paper in the form of a competitive price, however, and several of us are slated to try out Simuflite this year to directly compare experiences.
As far as I'm concerned the quality of the training hinges directly on the quality of the instructor(s) you work with during the week, followed by the quality of the materials used. A Level D sim is a Level D sim, doesn't matter which brand is painted on the side.
On a purely capitalist basis Simuflite moving into MMU should launch some positive changes for both brands. FSI TEB & ILG have statetd their awareness of their new "neighbor", hopefully the competition will stengthen both programs.
To answer your question, I'd guess that GWHIZ recurrents run in the ~$20K range. This is purely a guess as I don't have any experience with G programs but have attended F900 recurrents for somewhat less than that figure.