I'm gonna agree with and add to Audiojorge75 from the stand point of a good preamp/eq in either rack mount or pedal plus a P or J style bass. If you think the top 40 you will be playing includes lots of slap or tap, round wound string.
Most will say P is the most universal for this, which is a good thought. Since many of the top 40 hits over the years have also been recorded with a J, then a J is good too. I would refrain from basses with active electronics from the stand point of a good passive bass and a good pream or pedal (I use the Hartke VXL Attack) will allow me to dial in quickly all the usuable tones I would need, from clean to overdriven, bright to upright flat, quickly and easily.
I own many active basses, and I even use the pedal with it. However, normally when I'm using my active basses I keep my amp flat and control tone using only the onboard electronics. Usually fine. On my Kubicki Factor I can even get good slap tones using the onboard electronics and flatwound strings!
So, I guess what I could have taken a sentence to say was any passive bass with a P or J pickup configuration and a good eq/pre-amp/pedal.