I know how you feel Wilem... When I was younger, I didn't want anything to do with a Fender bass. I always thought they were too "standard" or "old school" (e.g.; not "cool" enough).
After having sold all my gear prior to a cross-country move back in the '90s, I found myself in Northern Arizona without a bass and ended up buying a Mexican Jazz, just because it was the only decent bass at the local guitar shop that I could afford. I thought it was just "ok" at the time and I always figured I'd get something "better" when I had more money.
Over the years, I've modded it with Bartolini pups, a Bad Ass II bridge, upgraded hardware, etc, but I still wanted... something else. I've owned a lot of basses in the last 15 years (some real expensive ones, some not so expensive) and no matter how high-end my latest "gotta have it" acquisition is, it always ends up collecting dust, because I ultimately end up going back to the ol' Jazz. And every time I try out a new bass, the Jazz is always the standard that I compare it to.
I eventually came to the realization a few years ago that I'm just a Fender Jazz guy (despite myself). They're one of the most versatile and comfortable basses out there and they're infinitely configurable. After 15 years, it still plays like butter and it can growl like a beast or purr like a kitten. Every note sings (not a single dead spot on the neck) and it sustains for days (which I attribute mostly to the BAII, but still...).
As a result, I don't get GAS that much (except maybe for another jazz bass!). I think it's better to want what you have, than to have what you want, and every time I pick up my Jazz, I'm grateful I have it!