What is the best Air Purifier for your money?

Hello!

I am interested in purchasing an air purifier to help rid of the dust my dog tracks in as well as indoor cigarette smoke.

I don’t want a cheap that will have to be replaced soon or doesn’t do it’s job, yet, I don’t want to pay more than maybe…$300.

Any advice would be greatly appreciated. It helps to receive answers from those who have experience with air purifiers.

Thanks so much for your help!!!