Always a good time trying to figure out a good margarita. Obviously different people like different things so just try different stuff until you figure out what matters to you. There are a couple of ideas to keep in mind, though. Fresh juice is always the way to go. Always. Fresh juice > pasteurized > powdered mix. Also, don't pay too much for the tequila. The qualities you pay a premium for (smoothness, flavor, nuance, etc.) are quickly lost when combined with multiple other ingredients.
1.5 oz tequila
.75 oz triple sec
.75 oz simple syrup
.75 oz lime juice
.25 oz oj
That's a pretty generic place to start from. If you want it a little more boozy add another .5 oz tequila and subtract .25 oz simple and lime. Try it with agave instead of simple, or cointreau or grand marnier instead of triple. Maybe switching to cointreau instead of triple makes it too sweet so reduce the amount of simple. Try it without simple, but increase the triple like HouTex's recipe above. Maybe you want to muddle some shit in it. The fun part is you just have to make and drink different margaritas until you find what you like. Shitty huh?
I have been enjoying jalapeño margs lately. Take 2-3 slices of raw jalapeño, depending on how much heat you like, and muddle with a splash of simple. This kind of candies it just a little. Or muddle with splash of lime if you don't want the added sugar. Do this in a shaker can then build the margarita in the can with ice, shake, and dump into your glass.