got- honestly, I am not the Mexican foodie in our household- my wife is. Having said that, I'll go with both her and TA recco's for some places "within the grid" of downtown in the city Sacramento.
TA reviews classify Mexican/southwestern in one big category, and I think that is a bit of disservice to reional cuisine enthusiasts. For example, The Tower restaurant comes out on top of a TA search for Mexiacn food, and I would not put it near the top in that category. Its a great place, but more for southwestern influence.
I would check out menus and reviews for Ernesto's, Tres Hermana's, Zocalo, and Vallejo's to start. Ernestos and Zocalo are usually busy, and have a wonderful following. Online menus available. All are reviewed extensively here on TA.
I hope to actually start a nice thread here for you, and lets get some quality input about specific Carne Asada experience. Thx, Dave