For the mild brands, my favorites are the easily obtainable (and cheap) Franks Red Hot, Cholula, and Tapatio.
For the hotter ones, I like Dave\'s Insanity, Gil\'s Crying Tongue and Cajohns Cayenne Puree.
The Blairs 3am and onward hot sauces are not really sauces, they are extracts and will probably kill you if you take a lot at a time. Or at least send you to the hospital for stomach pumping.