Which all-in-one PC should I buy for home use?

Kate needs to replace an ancient laptop and for ergonomic reasons she'd like an all-in-one PC instead

I have an ancient laptop that needs replacing as soon as possible. I have a desk at home and do not need the portability of a laptop, but I would like an all-in-one to stop me hunching over the screen. I will use it for web browsing, sending emails, collating photos, and tasks like my ancestry research. What would you recommend? Kate