Hi, I currently own both Keytron SD1 and Tyros, thet're both excellent...main different is 76 keys in SD1, but you should be used to PSR3000's shorter keys.
:- Sounds wise, Tyros has more modern sounds, on the brighter side than Keytron, I especially love the Phased Rhodes of the Tyros....SD1 does sound good as well.
:- Style, Tyros swing and Jazz, old Discos style are very good to me, and this are the only group of style that sounds better imho than SD1. Tyros style sounds more polished production like you listen to Quincy Jones's or Celine Dione's( not my favourite singer) CD production. On the other hand, SD1 sounds kind of raw like bar band imho.
Despite all of these, I continue to gig with SD1 and XP60, I own the TYros since 02/05, but don't have enough confidence to use it as arranger in live. But that's only because I haven't spend enough time to do registration and preparation necessary for live playing. My impression of these 2 boards are based on live arranger playing only, SMF and sequencer I have no clue which one is better.

There are number of player that switched from SD1 to Tyros pretty sastisfactory in no time at all,' Roel' r u listening?

I probably confused you even more, but if I can be of any help, let me know!

Tye