Sriracha chile sauce, but find them all fairly mild in heat.....
I love that sauce and eat Vietnamese pho with it. That's as hot as I need these days and I can eat a decent amount of that sauce. With all due respect man need not go much hotter than that. My favorite hot pepper powder is circa 30,000 scoville with a nice deep red *real* color. I just use more of it for hotter. Go to Frontier Herbs for good hot pepper powders
That's where I discovered Sriracha, also, at a Vietnamese pho restaurant. I feel like I need something a bit hotter for putting on wings, though, because the standard cayenne or tobasco pepper based sauces just don't have enough kick for me, but I want something that tastes good, too. There's a couple of bars I go to that have really tasty suicide sauces - I should probably just try to find out what they use.