My #1 since the early 2000's is a Fender Hwy 1 Precision
Amen. I have a 2003 Hwy 1 that I have rarely played in the past year, but if I had to have only one bass, it would definitely be a contender. It is almost completely "stock." I think it has non-origianal strap pins, and one of the knobs has been replaced. At least I assume so, because the knobs don't match.
As an aside, while I understand the attitude of "if you aren't going to play it, sell it," I don't subscribe to it. I believe in "do what makes you happy." In my case, you might (objectively, lol) call me a hoarder, but I enjoy having a very large bass collection, and the knowledge that I have access to any of them at any time.
I just got my 1997 American Standard Jazz V out of the case and back in the practice rotation for the first time in...geez, probably more than fifteen years. I stopped playing it because I'd become dissatisfied with it, particularly the B string and the relatively wide nut. I've checked in on it from time to time, played it for a few minutes, and cased it back up. This time, though, it played and sounded right again, so it stays within arm's reach again in my living room.
This is the bass I bought when I jumped off the five string cliff - I had been exclusively a four string player, but my #1 (an Urge I) at the time got taken out of commission by a truss rod problem. I started gigging with the V exclusively the day I picked it up. I fumbled through all kinds of wrong note/wrong string problems until I got to the point that I could play it without thinking. That bass actually helped me land me a spot in a high-dollar band at one point - my audition consisted of asking me if I was the guy that played that "big jazz bass" at a local festival.
With a history like that, why would I sell it just because I don't want to play it for a while?