Heavier than an BK-9, though, Gary (if weight matters... I guess it doesn't! LOL).

Zuki, Depending on whether you LIKE the more modern sound of a WS and chord following arpeggiators, loop players and the like, you might find yourself in a more flexible place musically if you run a BK-7m from a decent WS, like the modern Motif's, Krome's, MO's, etc..

I would think that, if you are doing more modern musics, or smooth jazz (much of that is breakbeat and arpeggiator centric, these days), or you want a more easily programmable lead sound choice, the combination of an arranger with a WS could widen your sonic palette quite a bit.

I think this is better than the reverse... trying to run a modern WS or WS module from an arranger, which tends to be pretty inflexible with regard to MIDI implementation, and tasking buttons and sliders to control external gear.

Which Motif do you have?