Don't give up, Cass. A BK-9 and an iPad is a FAR better arranger than the G70 ever was. Lighter than the S950 too!

Basically, you like the G70 styles, those that aren't already in it can be added, and quickly tweaked to sound even better (the new drum kits up the stakes a lot), and the Hammond is SO much better, it is almost like an entirely new feature.

Sell that BK-5, get a BK-9. And buy a decent outboard harmonizer (they beat ANY in arranger one hands down!). I bet you it makes you take a second look at that S950. It IS a G70 in an S950 body, in many ways!
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An arranger is just a tool. What matters is what you build with it..!