Went to Californios this week for the fourth or fifth time, and it once again blew me away. The food is right up there with the best tasting menus in Mexico City, imo, maybe ranking just-under Pujol in my book. It would not surprise me at all to see this get a second star in the next couple years.
Tickets are shockingly easy to come by for cooking of this caliber. Food+tax+service comes to $204/person (at least for the tickets I bought this time) but the wine list is really fun so you'll probably end up spending more. Thankfully, the ticketing system ensures that past-you pays for the