One Consideration:
I used to be a Kenmore buff; I've had several of their vacs and liked them very much. In the good old days, they were an excellent combination of price and value.
But I'm no longer buying Kenmore, and the reason is parts availability after the sale. I find Sears parts to be very expensive, and many things on a Kenmore canister are proprietary, not something you can find universal or aftermarket parts for. Sears is also highly prone to drop parts availability; I had to retire a ten-year-old Panasonic-made vac over the non-availability of a hose, and my Kenmore Power Spray steam cleaner needs parts that are also NLA. This situation was not formerly the case; Sears used to be great on parts. But no more.
As long as they work, Kenmores are as good as anything out there. But when they go bad, then you've gotta deal with Sears, and that can be problematic, in my experience. For the long haul, give me Lux or TriStar or another premium brand anyday.