For 120 square feet, you're going to need between 12 and 24 pints of capacity.
The easiest way to find out what size dehumidifier you need is to use this free dehumidifier sizing calculator: http://www.homedehumidifierpints.com/
If you're looking for a particular dehumidifier that fits your 120 foot room, this Frigidaire at Amazon.com will be one of the best deals on the net, 40% off and free shipping (see link below in related links).
-Footnote- A pint refers to removing 1 pint of moisture per 24 hours in a standard humidity and at a standard temperature. Pints of capacity are the standard measurement for comparing dehumidifiers.
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