Vacuum Cleaners Discussions

Our 16+ years old Sebo C3.1 finally died (burnt electrical smell, the motor won't turn on). I recently purchased a handle/hose (last year) and a telescopic wand (three years ago) but the ET-2 powerhead is also probably going going gone (making horrible sounds. I did get a new brush for it a few years ago) note that I made a mistake a while back and purchased way too many extra bags and filters (though probably can sell these) 3500sqft house, very low commercial style carpet in most of the house (tile in entry, kitchen, and bathrooms) one story but have a narrow spiral staircase to a loft (i.e. would like a vacuum to be smaller/lighter weight, though the current C3.1 has been fine) three Samoyed dogs which drag tons of dirt/debris/leaves and shed lots of hair the vacuum will be used daily my wife has asthma, ABPA, and lots of other allergies, including pollen, fungus, dust mites, etc. should I attempt to repair it? if so, I'll probably also have to get a new ET-2 ($350) real soon... but will be able to use the bags/filters and have a newer hose/handle/telescopic wand. or should I look at getting a new one, if so what would you recommend? Sebo E3? D4 might be too large/heavy? Miele C3 (which version? way too many, a bit confusing...)? Lindhaus Aria? TriStar CS? anything else? thanks so much for your advice.