I would say choose a cartoon such as a Leunig one that is simple and easy to use if you are going to have a third text.
Generally they give you enough depth without killing yourself by doing too much work for a text you most likely won't use.
As for your other one. Hmmm well, I used three more visual based ones because I find it easier (particularly when you are remembering quotes for so many subjects). Perhaps a picture book?