TJ's Perfect Margarita:
1 cup tequila (nothing too fancy, e.g. Cuervo Gold, Sauza Gold)
1/3 cup orange liqueur w/ conac or brandy (e.g. Gran Marnier, Bauchant, etc.)
1/3 to 1/2 cup agave nectar (to taste: more for a sweeter drink)
1/3 to 1/2 cup fresh squeezed key lime juice (to taste: more for a tart drink)
small pinch of salt
Pull all the above in a blender, fill with ice, and run on liquify for a few minutes. If you can drink a whole blender full, then you'll be feelin' NO PAIN
Best damn margarita EVER! Took me 14 years to find and perfect the right recipe. Seriously, it's been my life's quest.
(note: I've found agave nectar at Central Market (next to the honey), and I've heard that it's available at Whole Foods.)