When I bought a new vacuum just about 2 years ago, I referred to the Consumer Reports article on vacuums. I ended up with a canister from Sears, a Kenmore model. Although it does take a little getting use to (like having the canister follow you around instead of in front of you as you vacuum), I really like it now. It is great on stairs, has a telescoping handle to reach high places, a button for an automatic cord rewind (no more rolling up the cord myself! YEAH!), a POWERED hand attachment for the stairs (must have the powered one, not the air driven one), power controls on the handle, etc. One of the things I like most is that I can actually get under low places (like the bed & coffee tables) and completely vacuum since there is no canister to worry about getting in the way on the upright. Now I will say, if vacuuming with one-hand is a must, then a canister is not for you, stick with the uprights as you will sometimes need both hands since you will have to pull the canister along at times.
If you have the opportunity to try the vacuum before buying it, DO SO! Sears and Best Buy have a little place set up to give it a try. Make sure you don’t stick to the small patch they give you to try it out but instead move it around corners as you would do at home to get a better idea.
Good luck!