I ended up getting myself the DH Lifelabs - Sciaire Essential Air Purifier for my home.
It is pretty small compared to my old one so I had my doubts. Let me tell you, all my doubts were gone after the first day. It runs super quiet and it cleans the air like Nothing I've ever used before.
I love that you can set it a mode that will make it only turn on when it senses dirty air.
It works so well that I am getting another for my upstairs. 
Great little unit.