How do I control the temperature of my soldering iron?

I have a 25 watt 120 volt soldering iron that I want to be able to control the temperature of. It gets as hot as 750 degrees, and I want it to be adjustable to 350. I realize that I can buy a lamp dimmer, but I figured that a potentiometer would be cheaper and more effective. What resistance and wattage should I buy?
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