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The reason you don't see many variacs around anymore is that for most appliances you get better control and efficiency with a triac which is cheaper too.
As a driver for brushless motors, not so much. But otherwise I'd go with the 220 Volt transformer, then bring it down to your desired voltage with a triac.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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