I posted this in my own thread, but I'll say it again here. That M3 is a killer sound board. I'm considering buying one even if I don't buy a new arranger. For $1700, I can have the 61 note-er and simply remove the module when I need to.

An arranger unit interests ME also. You could use different name keyboards for lead and accompaniment sounds and MIDI everything together. You have the best of the best that way.