I have a Niflisk King... 9years old and still going strong! It has lots of filters for asthma (which is good for DH) and I had 2 cats (one being a Chinchilla Persian so LOTS of hair) and it handled it well.
Power and suction are awesome, and mum is always borrowing mine. Not sure how $$ they are, ours was around $600 but as I said that was a few years ago now