Cat & Dog models include powered hose, tube and powerhead. If you think you might want an electric powerhead, don't get this - the upgrade path isn't economically viable.
AFIK all Miele canisters use the same 1200w motor. The differences are in size, filtration, internal vs external tool storage, and most importantly, included accessories. Electric powerhead > turbobrush (suction powered) > handheld turbo brush > hard floor brush. And there's a couple variations in each category of head too.