We've been trying a LOT of hot sauces on our way down the Caribbean and through Central America. Forget bringing rum back to the states if you go there, buy hot sauce.
EDIT: That is a wrong thought; buy rum too. But that is another thread.
The one problem is that every island and country had their own sauces, and you can only use so much of the stuff, some times we'd not try the sauce from one place before we left it leaving us in the unenviable spot of not being able to get any more.
One of our favorites was from Dominica, "Belo's" hot sauce I think it was, the bottle is long gone.
We found some home made sauce at a vegetable Grenada that was great, went back for more but the guy was never there. We found a couple of nice sauces this way.
Some sauces were good, but had disastrous side effects. One particular Grenadian hot sauce did this, we loved it but my lower unit simply could not handle it. It is odd how some of these sauces can bring tears to your eyes with no ill effects, yet others that are equally or less hot can leave you on the head for half of the next morning doing your eye watering then.
Currently on board we have (outside the ubiquitous Franks, Tabasco & Sriracha)...
Trinidad "Scorpion" Sauce, made from Scorpion peppers (I think a 1.2M Scoville pepper?). Use in moderation, nice flavor but really, really hot. Of course in Panama we saw our canal adviser pour this stuff on a meat pie like ketchup and not break a sweat. A little goes a long way.
Red Heat "Aruba Heat" - this one promises to burn you twice. We've tried a little of this and its pretty good; that price is in Aruban Florins BTW, not USD. We had another really good sauce from Aruba, something "Red Woman's" sauce or some such thing. Didn't last long.
Panama - Tropic Pepper Co. "Xtra Hot Habanero"; we haven't opened this one yet as we've got several others going.
Panama - D'Elidas Picante Chomba, Habanero sauce. This isn't actually blindingly hot but does pack a nice punch. Found it in a restaurant, goes nicely on things like empanadas as it has a more interesting flavor.
Ecuador/Galapagos - Salsa de Aji "Oriental", which has a horribly racist caricature of a buck toothed slant eyed chef on it. This was on every table in the Galapagos and is an Ecuador product and doesn't taste so much like an Asia sauce as a pepper sauce. Nice kick, no side effects. At < $1.00 a bottle I should have bought more.
We have a couple of others floating around that we don't like quite as much that I won't dig up. I should have taken better notes, pictures of the bottles AND bought more.
Stateside - we used to make killer Buffalo wings starting with a base of Frank's pre-made wing sauce (used to get it by the 1/2 gallon at a wholesale club) then "tuned up" to actually get hot with Dave's Insanity Sauce.
That being said, I don't expect to be seeing any more good hot sauces for a long time. French Polynesia the food is fruity and sweeter, no hot sauces. Of course I've been rocking the Possion Cru...