Best Salsa/Salsa Bar in the City?

So, I plan on munching on a lot of Mexican food when I visit the great city of San Francisco this July. Many people will say the burrito/taco is made by the meat, and yes that could be true. I myself often find the meat of one good taqueria is similar to another......ahhh but the salsa....that is a different story. To me the salsa takes a good burrito/taco to a whole new level. So people, what ya got? Who has the best salsa to top my burritos and tacos?

Thanks in advance.