These are the vacuums that I have had experience with:
Pro Team Backpack
the Riccar Vacuum
I have used these for over 10 years. They have held up well for me and the price is not outrageous. Manufactured with quality materials, metal beater brush on some models.
I like the handy hose and attachments, but there are many different models so choose wisely. Some models are heavy.
They are made in the USA.
the Oreck Vacuum
the Sebo Vacuum
I bought mine several years ago, the one I saw online recently is over $800.00. You don't necessarily need an expensive vacuum to start with, but you do get what you pay for.
This vacuum has a metal beater brush base and there is an indicator light to tell you if it not functioning correctly