I'm trying to figure out what hepa filter is the best for my bedroom. We have 2 little dogs in the house, one poodle and one small short hair, and getting I need to keep them out of my room and keep air free of dander. Also, a portable for the car. I can't afford 800.00 ones. There must be one out there not so expensive that works. Any help would be great. Read so many options I'm now really confused.