I am a keyboard player for a church that plays contemporary music (modern). I accompany a singing congregation.

Which arranger keyboard is the best out there for my situation ? (Korg PA80, Solton X1, Yamaha 9000, Technics 6000, etc)

I currently own Korg i30 and use it as a one man band as follows:
Left Hand - Manual bass
Right Hand - instruments such as piano with String as the second voice
Rhythm - play without auto accompaniement

In my opinion, i30 is a little weak in the quality of the instrument sound and styles compared even to cheaper models such as Yamaha 740.

Let me know your opinion.