Consumer Reports Online says: The Kenmore (Sears) Progressive with Direct Drive 35922 {$300} excels at cleaning carpets and bare floors, and vacuuming using tools. The Electrolux Oxygen3 EL5035A {$400} offers more features, but is a notch lower for bare floors and tools suction and costs more. Both models are excellent when it comes to emissions. The Eureka Boss Smart Vac Ultra 4870 {$150} trades some through-the-hose suction for a much lower price. But its carpet and bare floors cleaning are excellent.

These are all uprights. Personally, I have had good luck with Sears/Kenmore, and they seem to keep parts in stock forever.