The Henry Autosave aint bad either on half power (about 600W). It produces enough suction to drive the Airobrush head without the need for full power.
The Purepower I have rated at 2100W is ridiculously powerful, and the motor gets very hot as a consequence, so much of the increased power only goes to heat the room in which the vac is being used.
My Kirby uses less than 1000W and it stays nice and cool. As a dirty fan it picks up from carpets excellently, but hose suction is not brilliant, however it will drive a Vax turbo tool quite effectively.
Look after the power hungry 1500W+ vacs of today - they will be tomorrow's dinosaurs. Look at how all the big engine cars have died out, and how everyone drives around in small engine cars of less than 1.5Litres now.
Who wants big 2.5litre Mondeos now?
Bigger WAS better, but as the Americans are now finding out, gas guzzlers are a dying breed as the price of fuel goes through the roof. As electricity keeps getting ever more expensive, like we use energy saving light bulbs, we should use energy saving vacuums as well - just like the Hoover Ranger was. It used just 450W.