I had a Dyson, although not a upright, and sold it to my parents as I wasn't impressed for the price after using it for a while (brush was air powered and wussy IMO, but I forget the model number). I had bought a Eureka Capture+ Pet Lover back in the day just on a trial basis to see if I'd prefer an upright, and I liked it much better and it did a better job at a much lower price. I'm sure there is similar and/or better stuff out now inexpensively. Important is just a good wand attachment, I prefer uprights, and its nice to have HEPA filtration so it picks up those allergens and doesn't just blow them right back out the exhaust into the air. Most of Dyson's patents have run out, so you can get the same tech from mainstream competitors for cheap now.
I mainly use 500 series Roombas though, as I'm too lazy to vacuum.

Considering they run every three days or so, IMO I get a better result than I do vacuuming simply because its more frequent than I'd be willing to do it by hand. Most of my house is tile though, and for tile or hardwood they work great, on carpet the battery limits how many rooms one can do.
When you think you've found a few in your price range w/ the features you want, I would recommend plugging it into Amazon.com. Its a great place for reviews. I'd just recommend not getting too hung up on price, as you hit diminishing returns pretty quickly on these, and in my experience a $800 vacuum is not even twice as effective as a $200 vacuum.