"But honestly if I had to choose today
and knew no more arrangers would ever be made
it would be a SX900 or TOTL Genos Yamaha."
I will have to reserve my comments since I have not played the Genos or SX s900..

But... and this is a big but (I made a joke)

Since Tyros5 and PSR 975 didn't even make my list... and Yamaha history of same old, it is highly unlikely that I would want the SX s900, and would never get ripped off to the tune of a Genos.

Donny as I mentioned before ..unless you spend quality time learning how to use any of your boards (and you can't learn anything in a matter of a few days... some folks don't learn in several years).
Setting up your old songs as MP3 playback with some accent sound when you feel like playing.. is not learning the keyboard..
This is where I think you are failing in selecting something that interest you..
Commit yourself to one instrument, even if it is a Yammy
