I once enjoyed a sauce called "Colon Ripper." Wasn't actually that bad, even though the name was mostly hyperbole. I mean, it was retardedly spicy, but I've had worse.
Dave's Insanity is excellent. Gunslinger is a decent jalapeno sauce, and I think one habanero sauce that wasn't actually overly sweet tasting was the "Inhuman Hot Sauce" I've only seen around locally.