I think Ac.Piano would be one of my most used sounds, followed by, SA Ac.Guitar, SA2 Jazz Sax, Strings, SA2 Harmonica, SA2Jazz Trumpet, SA Single Coil Electric Guitar, and SA WhiterBars Organ.

I can easily rhyme these off as that's how my 8 registrations are always set up.

For style specific sounds, perhaps electric piano, or a synth patch, for instance, I put them in the style's OTS, but the above are my favorites for playing instrumental music.

Ian