Sean.
A agree with Scott.
I think that Sd1 have a lot of very impressive styles but I prefer the simplicity and cleanness of 9000Pro.
The voices are good in both kbs with a special prominence for sweet/live voices and piano in 9000Pro.
If you want special voices, the way is a synth as Scott said.
Regards
Chico www.compumusic.hpg.com.br