Well this isn't really a wing sauce, but I've spend hundreds of dollars in search of the perfect hot sauce, and for my money you can't beat Blair's Sweet Death. It's not very hot, at least not to anyone who isn't a sissy. I believe it claims ~3000 scoville units which is just a little hotter than tabasco. But it has a sweet taste to it... it's just so good. I buy it by the case.
A lot of the sauces I've found are carrot-based. NAST. You can taste the a hint of carrots in them, and you can see the little carrot bits in the sauce. Tomato-based sauces are where it's at. Vingegar-based sauces are alright.
Another good and (cheap sauce) that I really like is Taco Bell's fire sauce. Unfortunately they only sell the medium version in stores, which isn't nearly as good.
Edit:
If you just want something really hot, find a sauce you like and mix it with some Dave's Insantiy Sauce or some other really hot sauce (or pure capsaicin)