Beaky, now that you will have MIDI, you will also have the option of getting a Roland BK-7M, or you can hook up to your S910 ( I used a P-85) to give you all those great Yamaha pianos/electric pianos/guitars etc....and, you can take advantage of the audio recorder as well...not to mention the styles.

I can't imagine not having an 88-note weighted action instrument, especially with today's affordability of these great lightweight pianos with MIDI features...plus, as you say, playing piano gives you a different, and always interesting, perspective.

Ian