Pierre,
your welcome, and what is wrong with your CV system? Often the motor brushes can be replaced, or the motor if the seal between the mounting and the tank is still good (not dry rotted). An Amitek Lamb 2 stage bypass 120 volt motor is not costly. My Hoover CV is from 1996, and still going. I replaced the hose about 10 years ago with one from Canavac. I like that it has no bag, just a polyester filter to brush clean when emptying the tank.
A new power unit can be bought for about $500.00 from Canavac (Canadian), Beam, etc. They are universal. The bypass 2 ir 3 stage moors are better. You can tell them apart by the metal exhaust horn they have vs. a plastic one. The least expensive motors are flow through, and don't last as long.
A new quality cansiter vac will set you back about $700.00 to $1,000.00. An Aerus even more. The refurbished generic Epic models I haven't priced lately, but they cost a lot less. They only have wooden beater bars. A Miele with a good powerbrush runs about $800.00 to $1,200. The top of the line $1,400.00 They are great, and super quiet, but bags and hepa filters costly.
Others avaialble are Riccar, and Simplicity.
I also have my moms Eureka Brandywine powerteam canister from 1980. Still going strong, but no hepa filtration of course. I use the powernozzle on the central vac often. The Vibra-groomer is still among the best ever made.