Air purifier to reduce dust in my room…?

I am looking for an air purifier that will reduce the amount of dust my room accumulates. Not just for the fact that I have a lot of expensive electronics in my room, but also because I seem to always have allergies. My room is about the size of an average college dorm room (not very big) so I am looking for like a table top one or something for less than 0. I was looking into that ionic breeze, however it got a good deal of negative reports especially from consumer reports. Anyone have any recommendations?