@rms1954 I know people who spent over $2000 on a mattress and are also using toppers. I can still remember the day in the 70s when I went to a mattress outlet and told the owner I wanted an extra firm mattress with a simple cotton cover. He asked, "Have you ever heard of horsehair?" I bought it for $100.
It's true that horsehair mattresses last forever. I've just had to change toppers as I've aged and needed a softer surface.
Good luck whatever you choose!