Some recommended plugs are:

Champion RJ12YC
Champion 8339

Of course you can always try to buy plugs without resistors. Plugs with resistors usually have an R in the part number. Some marine spark plugs are built without them and there are the Firestorm plugs which are soon to be released to market which you should keep an eye out for when they finally arrive.

This vid demonstrates howto remove the resistor from a champion spark plug for use with the water/plasma spark circuit.

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