I've been trying out different hot sauces from local Mexican markets.
Two gold standards:
Tapatio, the 99 cent Tabasco of Latin America. My lady-love got me into this stuff, saying that it was absolutely identical to the stuff that every family used in the Oaxacan village that she lived in. Not an astounding sauce, but a steady flavor-note that goes with pretty much anything vaguely Mexican. Availability: goddamn everywhere.
Inner Beauty Hot Sauce: the gourmet wonder-thing, brainchild of Chris Schlesinger. Availability: nonexistent, at the moment.
Other sauces: El Pato. More expensive than Tapatio, and kind of wimpy.
El Yucateca Picante Roja de Chile Habanero. Awesome. High, slightly sweetish flaming note. Rides over the top of everything, doesn't obscure, burns pure. Availability: purchased at La Indiana Tamales, East L.A.
Bufalo Chipotle: Amy the lady-love spotted this in the Jons at Fountain and... La Brea? 99 cent bottle of pure chipotle goodness. Gotta scrape it out of t0he bottle with a knife. Made tostadas with homemade refried black beans, ripe avocado, and chipotle sauce. Sort of my own homebrewed variant on those avocado and chipotle tortas...
I'm not sure where else Yucateca is available, but it's worth the trip into East LA on its lonesome.