I confess that I have adulterated the noble margarita. I hadn't found a tequila I liked with margaritas, maybe because I'm too cheap to buy the really expensive tequila (and I haven't really liked the expensive ones I've tried).
So, I finally gave up. I use Trader Joe's margarita mix and brandy on the rocks, with a bit of water so it's not too sweet. And I know it's not right, but I like it.
Ahhhhh.
-Joe-