Rabbit Air Purifier Air Purifiers - Help Choosing?

Air Purifiers - Help Choosing? - rabbit air purifier

Looking for an air purifier / filter for my room. At the moment I'm in a bedroom, 15x15 feet, leaving aside the sink and entrance. I wanted an air purifier that I have a little fresh air. For now I have a table Sharper Image Ionic Breeze and I noticed a small difference in air quality. I have a rabbit model A2 Air is wall mountable, but seemed very complex and expensive filters. Has anyone an idea?

I want a better coverage if I move to a larger place (in one year to a year and a half). The noise is not a big deal, but it would be nice to handle.