AFAIK all the systems out there require you to start with Van's motor in the elevator. Most of the aftermarket systems provide ways to control the motor. If there are alternatives to this, I don't know of them. While Van's system does add to the cost, it is lighter and doesn't intrude into the interior. If you think you might go IFR (or even just autopilot,) the electric system does have some advantages.
Bob Kelly
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Bob Kelly, Scipio, Indiana
Tech Counselor
Founder, Eagle's Nest Projects
President, AviationNation, Inc
RV-9A N908BL, Flying
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