In the last 10 years, I have owned and parted with three vacuums - Sharp, Hoover windtunnel w/ bag (best out of the three) and Hoover Windtunnel w/out bag (the WORST out of the three - it just fell apart!)
In October, I finally agreed to having the Kirby people come and show me a vacuum/2 room shampoo demonstration. We bought a Kirby (minus the shampooer - I have a shampooer, didn't need that feature). I did, however, need a longer hose to do all of my stairs.
For the cost of the three vacuums, I could have had a Kirby. My neighbor just brought her Kirby in for a "tune up" and says that it works as good as the first day she bought it. Hers is 9 years old. I love it!!!!! I'm hoping it's the last vacuum that I ever have to buy. There is some wiggle room in the price and they always have financing options. They also had a "pay by cash/check option" for an additional off. We took advantage of that. Good luck.
EDIT: Someone mentioned Hoover... If they are talking about the Bagless Windtunnel - I had nothing but problems. It cost just slightly less than the Dyson, at the time, and, because I had pretty good luck with my previous windtunnel (w/ bag) I bought it. I did not have any pets and vacuumed twice a week and yet, in the middle of vacuuming, I had to empty the canister because it had already lost suction. Then the hose fell off, then the canister cracked........ Awful, awful, awful!