Hi Squeak,
You said it !!
Arranger KB are "king in my book" you can do a "ton of stuff" that you can`t do on a synth , without a computer and software, IMO !!
I tried the "Korg -Karma" put you just could not play it if your a solo player !! It had very good sounds and the appreg. was "kick`n" . But all-in all I prefer an arranger KB ,It`s all there !!!!
jedi