Telmo,
My experiences tell me that no arranger would be my first choice for this type of music. Knowing a little about each manufacturers sounds, I tend to agree with Carrie. I have a Motif ES, and it isn't quite top notch either for lite synthy sounds, but I've always thought the Triton series was among the best hardware boards for this type of music.
If your just looking mainly for sounds, and don't mind software, there are literally dozens of free and very inexpensive soft synths out there that combined would give you more in the area of new age sounds than any single hardware solution will.
AJ
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AJ