I currently have jut the one bass - in the past I've had two knocking about but since getting into 5 string my second 'back up' 4 string just wasn't getting used. I now only have one bass, a 5er, and it is the one for now and as far a I know the near and distant future. It's lightweight, sounds and plays fantastic.
I have two rigs. One lightweight head and a power amp/pre amp set up with a 212 cab. They cover all my needs and I think my stable is complete....... well I'd find it hard to justify any more kit