Power / noise of a 20" core 2 iMac?

How much power is used as measured from the plug in the wall with a 20" imac core 2? I'm pretty "green" and am curious how much electricity I'll save over my current setup if I switch. According to my "Kill a Watt", my P4 desktop + LCD monitor pulls 135W when idle, and about 180W under load.
Also, how much noise does a core 2 iMac make? The local Apple store is a bit too loud for me to test this myself. My ancient powerbook g4 is very loud when the CPU is loaded, or it is otherwise warm. Since the iMac is basically a laptop, I'm worried it might have the same sort of small diameter, high-rpm fans which will annoy me in a quiet room.
Thanks for any info!
Drew

Electrical and environmental requirements
Meets ENERGY STAR requirements
Line voltage: 100-240V AC
Frequency: 50Hz to 60Hz, single phase
Maximum continuous power: 180W (17- and 20-inch models); 220W (24-inch model)
Operating temperature: 10° to 35° C (50° to 95° F)
Storage temperature: -40° to 85° C (-40° to 185° F)
Relative humidity: 5% to 95% noncondensing
Maximum altitude: 3,000 m (10,000 feet)

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Power / noise of a 20" core 2 iMac?

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