I don't use an arranger anymore since years.
Actually since I started playing in a rockband I used the arranger a couple of years for piano/organ/strings, but switched to a Roland 760 since approx three years now and never looked back to the arranger which is collecting dust.
For composing I mainly use a Kurzweil K 2600
and real instruments.
Fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76