Denis ..... have you thought of the Korg SP500? It's an 88 key, weighted, arranger/piano and it's pretty good ..... if you don't need a lot of fast change buttons. The arranger section is almost identical to the is35/50 and not too far off of the PA80/60. It's worth a listen - sounds good, feels good, and you can do everything with one keyboard if your needs are simple. If not ..... almost any controller will work well with the PA80 as a slave ... just set the transmit chanel of the controller to trigger the arrangements. It's a snap.