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sencore is great, but all you really need is a isolation transformer. Most variac's are autoformer type which do NOT provide isolation.
If you get an isolation transformer make sure its up to the task, I am not sure how they rate them, but figure you want something that can handle 4amps that should cover pretty much anything that you may ever come acrosss.
I have looked at the sencores PR57's they look nice but are not cheap. My rig is a homebrew with a isolation trans that is connected to a variac, with AC volt and AC amp meters so you can monitor both volts and amps while adjusting the voltage.
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