Well, do you mean backing tracks, or arranger features?

Backing tracks (or SMFs) can be played by most arrangers and modules. There are few modules being made any more, with Ketron being probably the main one, now. Their MidJay has a few strong supporters here...

I would take chas's advice (particularly as he specializes in that kind of music) and give the Korg's a try, but cover your bases and try others too...