Konica used to make SR-G 3200. It is the only ISO 3200 color film I've ever seen, but I'm mostly into BW. I have some stashed in my freezer. It looks absolutely horrendous when actually shot at 3200. But if you shoot it at ISO 800 it has a lovely grain and super saturated colors.
In my opinion, and I'm sure there are folks who've had better results than me, there is really no such thing as a film faster than 800 no matter what the label says. I've used SR-G 3200, Tmax 3200, and Fuji 1600, and all of them seem to me to be ISO 800 films. When you shoot them faster than that then negs look thin, and the quality begins to deteriorate rapidly, even with compensation in development. Maybe someone can clue me in on the trick. Possibly some developers would be better than others for the BW, but I don't know what you could do about C41 or E6 process.
When I need to shoot color film in low light I usually stick with a fast fixed focal length lens (I can't afford a fast zoom), and shoot Fuji NHG 800. I try to stay at 800, but I've pushed it one stop to ISO 1600, and had okay results.
What are you trying to shoot?