I'm a Tequila guy. I drink it straight, no rocks, no training wheels. 100% Agave is the baseline, if that's not on the label it doesn't even make it into a Margarita.
Don Julio Anejo is the one I buy when I just want a good Tequila.
My wife bought me a bottle of Don Julio Real when she told me that she was Pregnant. Unbelievably good but the price makes it something that I probably wont buy again.
Jose Cuevro Tradicional is the best bang for your buck Tequila out there. I drink it the most, and it's a great Tequila for Margaritas.
Cazadores is another great Tequlia for the money, although a little more than the Tradicional it's great back up.
My all time favorite Tequlia is Don Julio 1942. WOW! It's not cheap, but man is it good. It's about 1/3 the price of Don Julio Real but oh so much better than all the others I've had. Don't let my small selection fool you, I've tried a lot of Tequila. Don't you dare put ice in it or heaven forbid throw it in a Margarita!
Try the Nectar of Gods, and try it without the shot glass for a change.