Most musicians here play Yamaha Tyros, PSR2000/PSR2100, PSR550. Korg PA60/80, Roland VA and G1000 and Technics KN series. Others can chime in with their favorites. What instruments are the other two members of your band playing? If one is a drummer, I don't know how you would use an arranger, except when you are practicing and creating on your own.
Starkeeper