I don't want to leave your post unanswered but I have no clue! I've been thinking of getting one for R but I would have no clue which one to get either.
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I purchased the Homedics AR-10, but can't really comment on it as it hasn't really been put to use yet. I chose this one because it has gotten good reviews. My SIL went all out and purchased the Austin Air Healthmate Jr. for her LO's room and swears by it. I suppose it depends on how much money you want to spend and what is in your air (lots of dust, pet dander, etc.).
Re: Air Purifiers???????