The last thing I am is a wealth of information when it comes to liquor. However, I do love a good margarita, and margaritas are my wife's favorite. I've had some good ones out at restaurants and bars. Sometimes even the plain old margaritas are made extremely well. One liquor that I have experimented with (for the first time at a restaurant in Tampa years ago) is Midori. A well made Midori margarita is one of my favorites.
I haven't tried it, but I've heard that the Chipotle margarita at Outback is awesome. There's something else with the chipotle (pineapple?) but I can't remember. And Olive Garden has the Italian margarita...still have to try that, too.
Thanks, now I'm craving a margarita.