What's the best hepa-type air purifier (w/ permanent air filter) for a medium-sized room?

Question:brands looking at: bionaire, homes, honeywell. any experiences? willing to pay around $150.

Answers:
did you know that air purifiers dont really purify the air in your home all that well? test show that they only reduce about 5 to 10% of the pollution in your home and take more energy to use then they are worth and most of them release fumes into the air that damage the ozon and are being band by the goverment! You should really do some research before you get one that you think is going to help you but really ends up hurting us all in the end.

True Story!

Good Luck!