All of the models you mentioned would make fine 'camp-knives' imho. Fox fighter would also, I think.
Re: coatings-the Baby Whisper and the Companion are coated with John's trademark grey "crib-safe G-1 coating". It is some type of laquered finished sprayed over the bead-blasted finish blade. Very fine and durable, I might add. Doesn't detract from the overall aesthetics in my opinion either. The 'new' finish is a black UV polyester powder coat. I have both, the black finish is really nice looking, but more obvious (obviously!)than the grey.
Re: 8670-I still don't know much about this steel other than it is a tool steel from Germany used in the manufacturing\cutting of other tool steels. At one time John was using primarily A2 steel that he heat treated himself to an RC 57-59. I imagine he is steel heat treating himself, and would further guess that the 8670 is in this same range. Don't hold me to that as I am just guessing here. If I find out anymore I'll post it.
I happen to like John Greco's work-ALOT. It seems he is in touch with the 'working man' in both his style and his price range. Nothing fancy but when you get one in your hands it is very pleasing indeed. I like the fit, finish, and balance of his models, but knives are very subjective and opinions on them are well....we all know about opinions....
Heck for $50 what have you got to loose? Check out a Dangler or a Companion. If you don't like it-send it back.
One thing I will say, I have an MST II-5 that is the original A2 1/4" stock. To use a cliche' it is a very sharp pry-bar. This is not a cut on the knife design etc. Just an observation that this model is very heavy and very thick. It would be great if my plane ever crashed on a desert island-heheh. His new models, that is the ones now showing at CQC are of the newer thinner .210" stock. They feel much better in the hand balance wise, and would appear to be better general use knives. Personally I would take these slimmer models over the 1/4" stock models. I just don't have a need for that heavy of a blade in a short-bladed knife.
Mongrel