I often frequent chilli festivals in the summer, in particular the one in Chichester and last year there was one in Bournemouth that I attended too. It's a great way to get out there, try sauces before you buy and more often than not speak to the creators of said sauces to get their take.
Last year I picked these up:
Mostly naga based, but not as face meltingly hot as you would expect. With the exception of the "Who dares burns 2nd assault" which I bought solely for comedy value. I can safely say there is no culinary value in this sauce, whatsoever.
My "ketchup" hot sauce of choice is Dave's Temporary Insanity sauce, it's nowhere near as hot as normal Dave's but gives a nice kick. Works brilliantly in chili con carne, and mixed with mayonnaise is an awesome accompaniment for the trusty bacon sandwich.
In the pic above, there is awesome the Hot Headz Con Queso dip which is a beautifully smooth cheese dip for nachos and such. Good building hab heat, with the smoothness of the cheese to tame the fire.