I use my F5 a lot, and my F100 hardly at all - I feel bad about it, actually, but the F5 is such a great camera, it is my go-to film body. An F5 and an F100 make a terrific pair though.

I'd love to own an F6, but at current prices it's hard to justify. The F5 is 95% of the camera, and has features the F6 doesn't have like interchangeable viewfinders.