I have a lot of Gerbers as well, and quite honestly I like just about all of them. The Crucial F.A.S.T. is actually quite a nice little tool that gets little exposure, probably largely due to the original Crucial which is pretty crappy.
I'm not sold on the Fit, but I think that's more due to it being such a radical departure from the types of tools I am used to carrying and using, plus it's not terribly portable, which loses it a lot of points in my mind. Still, I agree with Mike, it is the best of it's type of tools, or at least the best I've seen.
The MP600 series is classic- they are as proven as any tool gets, and one could make a career out of just tracking down and obtaining every MP600 variant there is.
The Flik is quirky but I like it a lot and it's one of my regular EDC tools- and amusingly enough it saw some carry time yesterday because I couldn't find my Steady as I headed out the door!
My favorite Gerber? I doubt I could pick just one. There are some that are kind of useless and absurd, there are others that are no nonsense, tough as nails tools and lots in between and I appreciate them all for what they are.
Def