Personally, I'd be able to do any type gig just fine with a PSR-S910...an S950 would almost be overkill...both certainly have everything a "player" would want...perhaps a SMF user may want a few changes, but I'm also aware that workarounds have been found.

As someone here used to say on their signature..."it's not the keyboard...it's the keyboardist."

Then again, having the awesome Tyros4 on my keyboard stand is pure unadulterated pleasure!

Ian