Tabasco is my favorite, but it comes in glass bottles.  It's not easy to transfer to a legal container, and it doesn't feel right to not splurt it onto the food.  
I found a sauce called Huarache in a plastic 2 oz bottle that applies right, but isn't hot enough nor as tasty as Tabasco.
Sriracha HOT Chile Sauce is a Vietnamese concoction with plenty of heat and good flavor that comes in a 17 oz plastic bottle - right material, way too much weight.  This could be transferred to a small plastic squeeze bottle.  I put this sauce in a pool on the side of the plate and dip foods into it, so there's no splurt issue.

I probably should have filed this on the way too much of a small issue board, but I'm always looking for good hot sauces.