Hi:

Regarding the styles in the different boards I have then and now, well, I miss a few from the SD1.
I know that is subjetive, for example, I play for Senior Dances, a lot of Ballroom Music, so, there are styles That I see myself using more as example.
For Foxtrots (Med Tempo) I like the PA800
Similar but more Big bandish....the T2.
In Latin I like both......The Mistery Cha cha is Awsome in the PA800, I also use a LOT of user Styles in BOTH.
The S900 is VERY much like the T2, so, everything I say regarding the T2 applies to the S900.

The SD1 has busy styles, I had troubles with the limited polyphony, so, that make me switch brands....I will be looking close when the Audya cames out next year.