Back on topic, I'm thinking about something for my 40th, and have been given basically given carte blanche to get/get made whatever I want. It's making me self reflect heavily on what I am actually looking for in an instrument. I was initially thinking some sort of single cut, buckeye burl, fusion style bass. Then I went down the path of MTD, or F-bass i.e. basses that people who's playing I enjoy play. But the more I think about it, the more I'm leaning towards just (just) a P bass. It's something I've never owned, and they just sound beautiful.
So in answer to the question, I think "vibe" is my number one element when choosing a bass.