I've tried a few mega hot chillis but I can't remember their names.
Ones I can remember are Insanity sauce and West Indian Hot Pepper Sauce. The latter I used to have about 1 - 2 bottles a week.
As I live in portugal there is a spicy oil wich is made out of pure chilli (is made into souce as well but isnt as spicy) that is a hell of a lot spicier than tobasco. You should be able to get it where you are it's called piri-piri and it tastes gorgeous as well as burning your whole mouth untill it hurts
When I was the Chinese province of Schezuen I ate a meal consisting of a variety of meats in a sauce that made tabasco taste like a cup of tea, as far as I can tell it was more or less pure crushed chilli seeds... I can still remember the burning sensation if now.
It would be either Daves Insanity Sauce seen here http://www.mohotta.com/ShowView/product/311/6
Or Claras Pepper Sauce (made from Scotch Bonnets) from claras cake creations, that was nearly mind blowing.
i agree beenee, wasabi is hot! there is an Aussie brand of hot sauce by the byron bay chilli co that has jalapeno, cayenne and chipotle (smoked jalapeno) that is pretty fiery