OK, been away for a few days but I'll put some opinions out there, based on my personal observations and uses of vacuums over the years.
Orecks clean fairly well and are light, so they would be OK for a woman or someone with physical limitations, and the helper handle really does work, but they DO NOT hold up to commercial use, and probably won't last too long if used reguarly at home.
Kirbys (at least from my experience) should last practically forever and clean very well, only possible problem with them is the plastic fan is in the front and can be damaged but it is an easy and inexpensive repair. And yes they're heavy, that's not a problem for me and you can get them self-propelled Also, I can get a rebuilt Kirby with a warranty for around or a little more than the costs of a new hoover or oreck, so price is not really an issue, I'd never buy a new one though.
Panasonics have the fan behind the bag, and are the quietest ones I've seen, only problem is they don't pick up anything, you fill up a hoover bag vacuuming behind one, and Panasonics DO not last any better/maybe worse then Orecks from what I've seen.
Hoovers have always compared favorable to anything else over the years, Comsumer Reports picked them #1,(I've had a cheap one that still works well after at least 6 years) they hold up for a long time considering they're mostly plastic, inexpensive, and another independent agency tested the Hoover vs. top-line Oreck vs. Dyson just on cleaning and ranked Hoover windtunnel #1, Oreck #2, and Dyson #3, these were the only 3 tested in that one.
Dysons, I don't know much about them but people either love or hate them, many people say they clean VERY well and I have no reason to doubt them, I personally prefer a bagged design. My only worry with Dysons is that I have HEARD from many sources that they do not LAST long, again that is what I have heard I have never personally used one.
One last thing, Does anyone know anything about Electrolux and what they are making now, are they still i business and if so does what is made now compare to the old stuff??? I used to only use those and have an older upright and canister that is older than I am. Also, unlike the Kirby, the fan is Behind the bag, you can suck up nuts and bolts with an Electrolux, or at least you could the old ones. I've pretty much decided to go with Kirby unless I find that the new Electroluxes with the features I want are as good as the old ones. IF I were to personally rate vaccums from my own experience I'd put Electrolux (at least the models I've had and used) #1 and #2(tie) Kirby and #2(tie) Hoover running about the same, slight edge to Kirby for greater durability.
Thanks a lot for the suggestions and these opinions are simply based on my personal experiences with various brands over the years (only one mention I can't comment on myself is the Dyson, but am open to opinions/suggestions)