Jim,
Halon fire suppression systems were phased out, starting over twenty years ago because of ozone depletion, and new system sales ended around the 1994 to 1995 era with very few exceptions. The feds decided that halon gas was harming the ozone layer, so it went the way of Freon R 12 refrigerant.
The Cold Fire systems (a wetting agent) are being sold as a halon replacement, even though they are totally different systems. It is not the best system, but it is probably the best one that the government will let you buy. However there are several recognized halon alternatives that I have heard of that you may want to look into. They are Inergen (a combination of nitrogen, argon, and CO2), DuPont's FM-200 (heptafluoropropane), FE-13, FE-25, or FE-36, and of course CO2.
Gerald