I suffer from allergies. I have the Honeywell AirGenius 3 HFD300 Oscillating Tower Air Purifier in both my bedroom and living room. I have been very happy with it for well over a year. I like that there is no filter to replace, I vacuum mine, and I am always so surprised by how much this thing takes out of the air. It has a light that tells you when the filter needs cleaning.
As I said mine is the 3...there is now a 4 and a 5 version of this unit, but I opted for the 3 to save some cash since I wanted two.