Try Mariachi's on Yonge bw Eglinton and Davisville. I agree that SW USA and SoCal have far better Mexican restaurants, but this is pretty close. Very authentic and affordable.

My wife and I have been to this restuarant several times (both lunch and dinner). I would highly recommend the lunch buffet because of the price ($10) - more bang for the buck.

Dinner at the restuarant is very good as well due to their attentive, friendly, and knowledgable staff: however, the price is a little steep considering the menu is practically the same as their buffet. Try the Kashmir, which is around the corner from the Chef of India, to get a comparison of the quality and price of Indian cuisine in the area.