I have a dehumidifier that works very well, but is very loud. We need it in our game room (basement), and it runs almost constantly. Therefore I want the quietest running unit that I can find. Any suggestions???

Hello, I'm about to install a new humidifier in my house and I need some advice. I plan on getting either the Aprilaire 400 or 600 and I wanted some help on which deciding which unit to go for. The 400 uses a wicking action in its filters and wastes no water, however, the costlier filters must be replaced at least twice a year. The 600 uses cheaper filters that are only replaced once a year, but uses significantly more water, much of which goes down the drain (the drain is already present). It is also slightly cheaper than the 400. Aprilaire says they both perform similarly, with an evaporative capacity of 0.70 gallons per hour. Is that true? How much water can I expect the 600 to use? I run my fan 24 hrs/day. Will that make a difference in total water consumption? What it boils down to is, given the cost of filters and the frequency of changing them, and the cost of water flushed down the drain, which if these is cheaper to run? Thanks for your help. - Bill