I like all the ones mentioned here on this thread. I use Valentina, Tobasco, Franks, Cholula, and homemade sauces the most since my fiance is Mexican.
My ex-GF used to drink the Black Label Valentina sauce straight from the bottle She'd go thru a few large bottles a week. For her birthdays and Xmas etc, i'd wrap a few large bottles for her, and it was always her favorite gift