We just bought one from Costco warehouse early December and absolutely love it. I have been researching Dyson vacuum and central vac for a while and am not impressed with the price control by Dyson. You'd get a much better price if you bought from U.S, but you will lose the 5 year warranty.
The Miele is quiet, and it really really sucks. Yes, you need to buy bags and filter once in a while, but we have used it for over 3 weeks now, the change bag light is not on yet. They give you 4 bags and one filter in the box, and to buy additional is an extra $15 ish.
We bought from Costco for under $400, and there was a $80 coupon, and 5 year warranty. But usually Jan. and Feb. will see a lot of home cleaning and organizing deals.