Increase your budget to 30-35 bucks. You should be able to buy Ketel One, Stoli or Grey Goose. Tito's which is smoother, will be a couple of bucks less.

Whatever you do...don't go for the bargain basement $10-$15 bottles. Guaranteed wicked hangover for you and/or guests the next morning. Plus, they will be wondering who bought this cheap ****.