I don’t need a new phone anytime soon but if I needed one, my dream phone would be the build of the iPod Touch 5 (I love the small reachable screen and thin body) but with a good set of cameras, long battery, and modern features, and without risking bending or anything. Not possible I don’t think, at least good battery in such a small package, but that would be my dream.
Funny enough I have a large phone right now. I love the battery life but the size does really bother me. I like to use my phone with one hand but it’s incredibly inconvenient with a large phone. I don’t have tiny hands but barely reaching the opposite edge of the screen isn’t the most comfortable.