Hi John,
Believe me, the S950 is a very nice piece of kit, and I was very impressed with Peter Baartmans demo, but if one has no real use for VH2 (if they aren't a singer), and Audio Drums aren't really your thing, then the S910, as it stands, is a very well done arranger.
A lot of "out frontness" in the S910's drums can easily be achieved with EQ and Filtering (as can the regular drums on the S950) and, if I was a home player or didn't mind carrying two arrangers, then your suggestion of getting both an S910 and Korg PA-600 is a good one.
For me, I'm basically a "one arranger guy", so an S910 would have done nicely (I don't use Vocal Harmony very much), but, being able to get a nice new Tyros4 at an attractive price was an offer I couldn't refuse.
Now that I have the Tyros4, I am totally enamored with it...I love the FSX action and having aftertouch (and being able to use SA/SA2 Voices in the styles), although, I must say, the S910's action was quite nice as well...very light, responsive and fast.
But, the Tyros4 is still the Yamaha arranger to have if you want the best, and to enjoy SA2 voices and the other perks...of course, that's why it costs so much more.
An S910 and a PA-600 would be quite a complimentary (and contrasting) combination...especially if you already own one or the other.
Having said all that, I have a feeling the S950 will do very well...I have had many, many emails regarding it.
Best regards,
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.