Andrea,
Sounds are so subjective as we always say. I find the piano's ( acoustic and electric ) to be better on the Motif ( electrics and particularly the "Rhodes" a lot better ) . The guitar emulations too. I'd give the nod to the 9000 series on sax and horns though. As far as cold though.. not at all to me. If seanbaker is looking for more electronic and "cutting edge " type sounds, ( as i find myself doing more of lately ), then I'd have to recommend the Motif. Drums are my "achilles heel" too, but if you don;t need them in a live setting and can compose with a the aid of a computer, there are more than enough excellent programs out there that can assist with drums, and that don't have the limitation of providing "locked" patterns like an arranger does.
I really can't say that any of my arrangers have been the better tools for composing. Even if I were to use a lot of the auto accomp in a song, to get that more realistic feel, there is a lot of midi editing to be done later.. subtle things like changing accents, velocities, slight timing variations.. all the nuances that go into trying to emulate a more "real" or "live" performance.
AJ
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AJ