We use the Honeywell Air Genius 5, and got it on sale here in Canada for $169.99. It does a fantastic job and is very quiet. I also like how it has a night light on the bottom.
I'm also considering a room air purifier. I would like one with HEPA filter and carbon pre-filter. From what I've read, it sounds most efficient in removing particles from the air including pathogenic particles and mold spores.
I'm concerned about the noise, but from what I've read, these modern ones on the market are quiet and energy efficient.
Good luck finding a good one. I wish I could suggest one for you, but I'm looking into it myself. Thanks Terry for the suggestion of yours
I use carbon filter the filter holds about 50 lb of carbon and works for 2 years then you change it out
they run off the house ac or heat and cost about 200 each