I have 3 currently, but I've found over the years that the right 2 pickup, 5 or 6 string bass can get you through anything under the sun...It's all a matter of:
1) Pickup focus
2) Right and Left Hand technique
3) Rounds or Flats
4) Midrange freq and boost/cut
I have a modified Sadowsky Reverse PJ 5'er and it's worked wonders on everything I've thrown at it (on a regular basis: Classic and Modern R&B, Gospel, Big band Jazz, Funk, Reggae, Calypso, Salsa, Pop-Rock, Hip-Hop) so 99 times out of 100 I take nothing else with me...The 70's style Fender J (rounds) and the 80's Yamaha BB1600 (Flats) get used only for teaching, recording occasionally or just noodling around at home...not worth the few dollars to part with them
I do have a LGW Torzal 6 String on order that may give the Sadowsky a run for its money though...we'll see...
Sadowsky #332, Yamaha #336