Looking at getting a DSLR finally...suggestions for $600 or under?

If I got a good enough deal I’d probably get a Nikon I really don’t have a preference I am just use to the Canon menus and what not. Most people say Nikon has a better GUI though for beginners. I have been trying to read as much as possible. I would consider a used one as well I just don’t trust buying off ebay too much, maybe I am paranoid.