I'm a bit of a purist. For example, when i see someone at a party ask for a martini, i mix it with gin. If they ask me to mix it with vodka, i tell them to FUCK OFF. Vodka, as far as i'm concerned, is just water with a kick. I only use the fucking stuff with Bloody Marys out of respect to Hemingway.
That being said, i'm a real nut for tequila. Doing shots of rested tequila in the cruda style (Lick your finger, dip it in a bit of salt, lick the salt off your finger, drink the tequila, take a bite of lime) is a good time, and a well mixed margarita (Not an alcoholic slushie but a real one) is also pretty good. But my absolute favorite is Kahlua. I can't go near the stuff, i just cannot fucking stop drinking it. Every time i got drunk enough to start singing karaoke, Kahlua was involved, to the point that now Kahlua is synonymous with the song "Suicide is Painless." It's so delicious it's evil.