I checked out both La Union and Moishe and Isaac to round out my search for a local Mexican grocery. Both were comparable. Both had a meat counter (although Moishe and Isaac didn't have house made chorizo, at least when I was there), both had modest selections of produce, dried peppers and Mexican dairy products.
Neither, however, had close to the selection, both in quantity and quality, of Carnicerias Jimenez. Given that by Google, Carnicerias Jimenez is 21 minutes away, and the Highwood places are 17 minutes, Carnicerias Jimenez is now my go to place when I need Mexican groceries.
Thanks to all who responded in this thread.