One thing I don't agree with, and that's that you HAVE to spend this or that amount of money to get a decent 5et. Or 4er, come to that. If you have a good, transparent amp, your bass, almost whatever it is, will sound like you. Of course, if you is not what you're after...
Classic example, though not on bass, is Carlos Santana. He has never sounded other than like himself and his rigs have changed radically over the years. My sound, such as it is, has changed little, no matter what I play.