Hey, Zuki, of course you will know what is best for you. I'm just glad to see you are thinking about getting back into your music...besides, advice is like castor oil...easy to give, but hard to take. Ha Ha!!!

John is right about the BK-7M being a tad hard to fathom, but if you have used, or have had any experience with, any Roland arrangers in the past while, it shouldn't be too bad.

DonM was using one with a controller keyboard and he seemed to get along fine with it.

I used a module a long time ago, a Roland RA-90, both with an arranger, and also with a digital piano...I eventually stayed with the latter setup.

Using two arrangers "live" can be challenging due to the many permutations and combinations available, but, it will also increase your palette of styles.

Good luck in whatever you choose.

Ian