I'm not a vodka drinker. We always have a bottle around for mixing.
However...
Rum - Depends on the application. Bacardi is the benchmark mixer. Meyers is strongly flavored, and can be off-putting to those expecting straight rum. But it's hard to argue with Meyers and OJ on a beach. Spiced rum can be fun. We used some Captain Morgan's Private Stock in our egg nog this Christmas.
Whisk(e)y - This is what I drink. All of it. Bourbon, Rye, Scotch. Canadian, Irish. Yes please. Mixed, straight, on the rocks.