I’m on the hunt for the best true HEPA air purifier. Any suggestions?

I’m in the USA looking for a good air purifier for a space of about 600 SQ FT. My main priorities are something that’s not too loud, and has a true HEPA filter to handle allergies, dust and cat fur. My husband and cat have allergies so it’s mainly for them. If you have a favorite, that’s a reasonable price, please share your recommendations.
Thnx!