I drank a few different vodkas when I use to house party, but always mixed. Recently (and FINALLY, since it was banned in my province until last month) got to try out Dan Aykroyd's Crystal Head Vodka, and could enjoy it straight over the rocks; virtually no aftertaste at all.
It was one of just a few vodkas - out of 200 competitors - to win double gold at the prestigious San Francisco World Spirits Competition, and Aykroyd himself has been traveling around N America to sign bottles for fans for quite some time now.
And as internet marketers, gotta give him credit for salesmanship by wrapping a (paranormal) story around his bottle design and explaining the creation process from using pure spring water from Newfoundland and wheat from the fields of Ontario - plus no additives, etc...
Crystal Head Vodka & Dan Aykroyd - YouTube
Anyone who enjoys a premium vodka should give this one a shot. Literally.