Well, I don't know your budget ..
And I am not in USA so don't know the exact prices in USA, but basicly your setup should have ;
1. a mixtable
2. an equaliser
3. a woofer
4. two speakercabinets with good quality mid and high speakers.

Ofcourse there are several combinations, like selpowered speaker cabinets or reverse a powermixer which has the equaliser and amp built in etc...

The reason is that with an arranger you want to cover all the emulated built in instruments, which means the full audible frequency spectrum. (20hz - 20Khz)
In other words a HiFi soundsystem for all your instruments.

Since you were a jazzguitarist, you know you can't use your guitar amp for the base.
The problem with the most keyboard amps is that they have only a few speakers which need to do all, while you have an arranger with drums, base etc....

If you let us know your budget , I am sure we have lots of members here who can recommand a proper sound system.

Since you played live profesionally, It's very unlikely that a low budget sound system will satisfy you. and will be a waste of money. most of them sound canned..

You can have an excellent sound from a low budget keyboard with a good soundsystem.
You cannot have a good sound from the most expensive keyboard with a crappy soundsystem.

I allways wonder how some use crappy soundsystems with top end keyboards, it should be reversed if money is the issue.

Fred