I'm a Vodka snob.
My favorite Vodka, International is without a doubt, Żubrówka ("Bison" in English). Some Polish guys introduced me to it, and I have been drinking it ever since.
http://en.wikipedia.org/wiki/Zubrovka
Domestic, is a run of the mill name brand, Smirnoff. I taste tested myself, and found out I preferred Smirnoff over Grey Goose.