Hi Moetyros:

Dito what George say, I own a Tyros2 and also the PSR S900 and IT IS great, I use the S900 it for small gigs that are short in time and I do not need to bring external amplification....
I also did own the PA60 that is the previous clone on the PA50, it is TOTALLY diferent than the user interface on the Yamis, also there are great boards too, but ONLY if you are unhappy with the T2 I would consider the Korg...

Bonus with the S900... Even the T2 registrations are ALMOST 100% compatible with the S900, you may need to make small adjustments depending what voices you may have in the registrations, and also the user styles.
I have no regrets at all...it was a wise investment.

I also own the PA800, but my main board still the T2.
Hope it helps, Good luck in your choice!. ;o)