My Basement has undergone a huge transformation... Instead of being the catch all for everything in my house, it is cleaned out and preparing to become a darkroom, finish area and an office (w/ PC, scanner etc.)... Well, despite cleaning, painting and other unbasement like tasks, the air is still fairly damp and still very dusty. Anyone use air purifiers, dehumidifiers, ion air exchange thingies or the like?? I'm looking for some recommendations... I need the whole (probably 900+ square feet) to be free of dust.