We got the Shark Lift-Away Pro Vacuum when we got Drago, and It has been really good so far. We looked at the Dyson Animal, and used a lot of the ones you listed in a display in Sears. The Shark has a much better price tag, and can be broken down very easy to clean any hair clogs that get stuck. Best advice, whichever one you get make sure to follow the routine maintenance in the user manual. A lot of the Vac companies turn down customer service fixes if it has not been adhered to and in the presence of your shedding machine it makes them that much more skeptical.