Chris and Roger summed it up perfectly. I'd agree that the 700 watt motor has enough power to get the job done, and I've never felt that it needed more oomph.
With regard to the four (!) floor heads supplied with the Miele, it's a nice idea, but you'll likely find most of them will never leave the cupboard. Toting them all around with you, and swapping from one to another each time you go from one surface to another, will soon get tiresome. A rotating brush for carpets, and ONE suction-only head for laminate, will do everything you need while keeping things as simple and practical as possible.