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Roland FR-1, 4, 7, 8X

It all depends on what you intend to do! :)
What would you use the Force for? The accordion is a MIDI controller and musical instrument, you can use it to make sounds like any other MIDI or analog instrument.
any device that can act as a MIDI controller will work with an AKAI Force,
so the FR7 is not as good a choice as the other Rolands, as it does not
have an easily useable MIDI out