Of course there's always Alberto's or sometimes the various off-shoot places (Albertico's, Rigoberto's, Alerto's)... love the late night "rolled tacos" covered in guaq & cheese!
Molca Salsa on Harbor & Imperial has an awesome all meat carne asada burrito.
Oh yeah, who could forget Pepe's? Love the red hot sauce but I pay for it the next morning! (Fire down below!)