Paul,

I agree with Donny here. I just got the PSR-750 last night and have not done much yet but I would never consider what you are considering, or it should be for transportation reasons.
Why splash out more than 1000 bucks to go from a Tyros 2 to a PSR950 when for the same amount of money ( or nearby ) you can have nearly the best of both worlds ? Tyros 2 + PA600.......
Patience is a virtue my friend !!!

regards,
John