We also enjoy their combination platter and nachos - we like to get both and share them. From what I can remember, the wet burrito is also very good.
One thing that is a must for me from Cantina de San Angel? The conga juice!!! It's a mixture of orange, pineapple and lime juice and it's sort of slushy. I personally think it is the most refreshing and tasty drink I've ever had.