BossX,
As you have found out, most all of the arrangers have speakers, as they are meant usually for a different crowd.
You can however turn them off like on the PA 80.
My suggestion is to buy an arranger that you like the way it plays the voices and overall how it works and put the speakers last on your list, meaning, it doesn't make sense to by an arranger that has lousy sound patches and is a nightmare to use, just because it doesn't have speakers.
The cool thing about having speakers, is if you want to just fire up and compose a bit or take it to practice or wherever, you don't have to lug your speakers too.
Terry