I would like to a few recommendations: For the Orange liqueur, I would highly recommend the following, Caffo Solara for a intoxicating blend or orange flavors, Solerno Blood Orange Liqueur and for a highly refined twist Bauchant Orange Liqueur. Grand Marnier and Cointreau are predicable outcomes which make for a boring drink. I really like Patton Citronage.
For Margarita ready made mixes, Ones using key lemons and lines will prove rewarding. Also, the mix must not contain any corn syrup. I have found Williams-Sonoma, Pineapple, Mango mixes are very good. I have on order the "Margarita Texas mix", this is using key limes, and has won many awards.
I like to keep my margaritas simple. I use fresh lime squeezed lime juice, Silver Patron, and triple sec. And, just a tiny pinch of sugar. My mix ration is 4 oz of lime juice, 4 oz of triple sec, and 6 oz of Silver Patron with the tiny pinch of sugar. I have tried making margaritas with Cointreau in place of the triple sec and I don't like it. I call those "dirty" margaritas because of the funky color the Cointreau adds. If you use my mix and pour it into a shaker, pour over a salted rim margarita glass with ice, it's a great tasting margarita that will give you a serious buzz. When I make margaritas, I usally make a batch of guacomole dip from scratch and serve with chips.
I've tried the Patron Citronage. Very good stuff. I've had Fortaleza for sipping -- really tasty -- like to try that in a Margarita. I am going to try the Solerno Blood Orange Liqueur. Sounds really interesting.
I'm open to other orange liqueurs for variety, but I disagree with the idea that Grand Marnier makes a boring Margarita.
For my money, fresh squeezed limes, organic agave nectar, Grand Marnier and tasty Reposado, in the right proportions, makes a damn fine Margarita!
any tequilia thats 100% agave would be fine, imo "platas" or reposados make better mixer than anejos - thats if i were to 'waste' a good bottle of Porfidio Barrique on a margarita imo, anejos are best enjoyed sipped straight from a cognac sniffer where aged oak, maple, tobacco, dried fruit and other notes can be enojoyed as its maker intended.
new tequilias seem to be invented on a daily basis even carlos santana, sammy hagar et al have their own brands. trust me on this, there arent the number of distillaries in all of mexico to support each individual brand. check the "NOM" number printed on the bottle, its given by the Mexican gov to each unique distillary, it protects the appelation and is certifed by the TRC. A $100 bottle under one brand is sometimes the exact same juice you get for $40 from someone else.