Dripping Springs Texas Vodka . . . don't know how widely distributed it is just yet, but it's fine stuff.
Reyka, the Icelandic vodka, is excellent as well.
Absolut makes a terrific Bloody Mary or Screwdriver. I like its crisp edge for mixing.
Recently, however, my local liquor store had Three Olives Citrus on sale at $9.99 a bottle . . . and I stocked up! Since I usually drink vodka as a tonic and lime anyway, it seemed like a good deal, and it has been. Quite tasty.
I like Grey Goose for martinis. It's like drinking a cloud . . . a cold, icy cloud. Sooooo smooth.
~Boar