I suppose you have your reasons, but I,as well as others, don't think you get that much more over the S910. I saw two on the Yamaha forum that had S910s, bought S950s only to sell them and bought S910s again.

Then again, some love their S950s.
Good luck
Bernie
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact