Electric basses, I'm currently down to two. As a professional player, I have my main player, a Status S2-Classic and for a more vintage woody tone, I have a Classic Series Music Man Sabre. I'm currently about to order another Status, but they are my mainstay instruments. Nothing fits or sounds better to me.
At one point a few years ago, I had seventeen basses - Lots of buying, collecting and trading was going on, but I still favoured my main bass.
I have most tones covered with the two I have, the new one I'm ordering will add an extra dimension, and then all I need is that elusive perfect Jazz bass. Then I'm done for the next few years.
In terms of double basses, I have four, including a Ron Prentice bass for classical work, an old 19th century German bass and a modern Chinese/Canadian model with a pickup for a Big Band work. For small jazz jobs I have a Warwick a triumph electric upright too.
I have no desire to go back to the heady days of mass collections, but the additional two electric basses will give me all the tones I could ever need.
Now, what about one of those new Gibson EB's? Aaarrrggghhh!