
SEBO
AIRBELT E3 Premium
Ultra-durable, 10-year warranty, but expensive with short cord.

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Look here, sir or ma'am! This young man just called Shark and Dyson the top names. He doesn't know what a Kirby is. For the young man, Kirby's are technically called a "rug renovator". When they put them in the tests with regular vacuums, they just obliterated them, so they made a new label.
I have a Kirby made in 1975 (Classic omega) that still works, but is more a novelty to me now. I prefer my 1984 Kirby Heritage, which I use weekly at least. Works great.
No offense, but unfortunately your budget is not enough. If he's a slob, and breaks expensive machines, this is his issue. Not your issue. I totally get it, if you spend a lot of time at his place, etc. I vote for spending time at your place. A basic shop vac might be okay, as long as there is no carpet. If you could find an old, used Kirby, that would be ideal. I've seen those on FB Marketplace, sometimes free. They might need a bit of fixing but build like a tank. Also very repairable. The downside, they feel like they weigh 100lbs. Or more if the direct drive is broken. My Aunt has two. The old one is from Mid 1970's. The "new" one, 1992.
Best vacuum I’ve owned. I grew up around Kirby’s and missed bagged vacuums. This also does NOT tangle really long hair.
Kirby upstairs and a Shop-Vac downstairs. The Kirby is an absolute beast, worth every penny.
Can't go wrong with a cheap Kirby with that recent servicing. It'll be a bit heavy to push around (pre tech drive) but AFAIK that's the only compromise

SEBO
AIRBELT E3 Premium
Ultra-durable, 10-year warranty, but expensive with short cord.

Numatic International
Henry Canister Series
Budget king, super durable, but heavy and poor on carpets.

SEBO
AIRBELT D4 Premium
Durable, powerful, long cord, but heavy and pricey.

SEBO
FELIX Premium
Durable, powerful, good for allergies, but heavy with awkward attachments.

Miele
Classic C1 Cat & Dog PowerLine
Durable, powerful, quiet, but very expensive, short cord.

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
SEBO - AIRBELT E3 Premium

Ranked #1
Numatic International - Henry Canister Series

Ranked #1
Dyson - V15 Detect Series