I have had good luck with Hoover. I subscribe to Consumer Reports online, and it is worth the money! They don't rate Dyson too well. I also got a canister one they recommended, forget the name. Now, the Hoover ones that I've gotten were very inexpensive for upright ones, and they're bagless. They don't seem to be working so well now, but after 3 or 4 years of heavy use, I got my money's worth from them.
I also love love love my new Hoover Platinum cordless one, for the kitchen area (with my kids, I vacuum the kitchen at least twice a day!). It was pricey for a cordless ($150 or so) but it does so well!!! I may buy an extra battery for it. It even does a decent job zipping over some rugs.
I'd check out some reports first, as Dyson is expensive.
Kenmore also gets good reviews.