Wait till you have to drag your S900 AND an 88 around...

Their combined weights will easily equal my behemoth Add in a two tier stand, two road cases, more setup time, cables, ways for things to go wrong, and the difficulty Yamaha make you go through to integrate the two for anything more than just the basic MIDI connection (you will probably want to drive the S900's arranger section from the 88 in Piano Mode, but then probably play a solo section on the S900 with both hands - best of luck getting the S900 to do that, or other performance tricks) and you have a recipe for frustration.

But I look forward to hearing this monster rig when you finally get it. I hope things speed up in your recovery, and you can get back to doing what I know you love so well

(Been recording anything new, lately? Send me some more, I really enjoyed it... Get better soon, my friend!)