As someone who has looked far and wide for the hottest sauces available, I can say without hesitation that Dave's Insanity hotsauce is the hottest series, with his ghost chilli blend as the hottest hotsauce available.
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Nothing, and mean nothing, will burn you like this stuff will. I bought my buddy a bottle of this in Granville last year. One time we were at his place and my other buddy made chicken fingers and thought it would be a good idea to pour the sauce all over the food, not realizing just how deadly it was. Many a rings of fire were had that weekend. If you want hotsauce that is as hot as it gets, bar none this one wins. However if you are looking for something that is also reasonably flavored, Dave's insanity garlic sauce is quite delicious.