My fave at the moment is Thai Chili Sauce. The kind bought at the store. My fallback is Sriracha.
But those are for Asian meals we eat. For everything else, it's chipotle, harrisa, jalapeno, habanero, or any combo of the above. We have about a bajillion combos in the fridge. Green chile even provides a small kick and flavor without detracting from the flavor of the food. We usually cook it without anything and then add to our separate plates later (he's Mexican, I'm Caucasian). He also seems to like salt a whole lot more than I do.