EC5... five buttons? No controls. $100 http://www.musiciansbuy.com/KORG_EC5.html

Yamaha FC10... Three 7-segment LEDs, 27 LEDs, Panel switches x 5, Function select switch, Foot switches x 12, Foot controller x 1, MIDI IN/WX-IN select switch http://www.zzounds.com/item--YAMMFC10

About $300. Sounds like a bargain, in comparison.

I know which I would rather have
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An arranger is just a tool. What matters is what you build with it..!