What's the best Windows all-in-one or iMac for illustrators?

AT wants to replace her MacBook Pro with an all-in-one computer with a bigger screen

I'm an illustrator, and I'm looking to replace my old MacBook Pro with a PC. I have a budget of up to 1,500, but would love to spend less if possible (about 1,300). I mainly use Adobe Photoshop for digital painting and editing scanned artwork, InDesign and occasionally Illustrator.

For space and comfort reasons, I would ideally buy an all-in-one. I want a fast processor, lots of RAM (16GB at least) and a good screen display.

Last September, Bernadette, a writer and photographer, asked for a cheaper Windows alternative to her MacBook, and I was criticised for recommending that she stuck with what she knew. Guess what: I'm going to do it again. Anyone who switches either way will lose some of the benefits of years of experience, and will spend time relearning. Lost productivity is a cost.