Longish thread but I can jump in here as some of you are starting to make sense (finally) on this very important issue.
Now, I can see mixing your Bacardi's and Jack Daniels and so forth with Coke or Sprite but not your higher shelf stuff. And I'm saying this as a big rum and Coke guy. However, with the really top shelf stuff there is only one way to drink it and that is "neat". If you just must mix it with something, try a nice cigar.
I had a girlfriend buy me a $200 bottle of Johnnie Walker (Blue Label) and she wanted to drink hers with 7up. I should have slapped her. Bogart would have slapped her. But, I just sighed and committed what can best be described as "alcohol abuse" and let her have it her way. What a waste.