questionswhat's the best humidifier to buy?

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We sprung for one of these (much cheaper at Costco) and have loved it: http://www.amazon.com/Germ-Guardian-H-3010-Ultra-Sonic-Humidifier/

No filter to worry about, very low maintenance (which was important, given my natural laziness). Nowhere near as problem-prone as other, cheaper humidifiers. Look for ultrasonic ones if maintenance hassle is a concern.