Depends on your taste!
Don't forget, as well as project gutenberg usa, there's also canada and australia websites, with addiitonal stuff. For those, you can't download on kinde as a mobi book, and will need to use your home computer, then transfer across ....
Also Web Archive texts, you can download most books there directly as mobi format ........
I'd suggest George some George Orwell, Viriginia Woofe's Orlando (very funny), and some early Grahame Greene is also out of copyright. And sherlock holmes ..... and "the complete h p lovecraft".
Proj gut usa has a highly amusing book on "penis pencils" called Perfect Manhood, look under health ........ and the Fu Manchu novels by Sax Rohmer.