Vicks V790 Germ-Free Warm Mist Humidifier
Although the high water temperatures of warm mist humidifiers usually kill most germs and bacteria, the Vicks takes sanitation a step further by incorporating a built-in UV light to kill up to 99.9% of germs. This excellent warm mist humidifier also features dual tanks which are easy to fill, meaning that you won't need to shut off the unit in order to add more water.
The tanks can hold enough water to last up to 24 hours per filling, and has a refill indicator light to let you know when it's time to add more water. Beyond some soft gurgling sounds, the V790 is quiet when in operation, and can also be used with liquid vapor products in the included medicine cup. This humidifier is not the cheapest, but offers lots of utility and convenience.