I bought a DEFENDER or Filter Queen, recirculating air cleaner a year ago. It has the reputation for being the top of the line. It is a medical recirculating air cleaner and clears out, dusts, pollen, smoke, cockroach allergens, bacteria, mold and pet allergens that may lead to allergic reactions....and tobacco smoke and other household allergens. There is a charcoal filter with the unit too. The company also makes a vacuum cleaner that is great and really gets rid or the dust mites and not just recirculates them into the air.
After a year of having the products, we are happy with them, and I feel there is a real benefit to having purchased them. I must warn you that they are costly....but we voted for health here. A person actually came to our home to demo all before we bought it all. I hope this is helpful for you. Good luck.
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good air cleaner/purifier?? 
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