Instead of gutenburg you might like
Feedbooks you get a better book cover and they are put together a bit better (like margins) and way better search engine so you can find what your looking for faster and easier. Thats what I use when I want to get a book that I might read later but not right now so I don't want to plug up my Kobo with it I just put it on and SD card for later. Wow good deal on the Kobo if you got it for $50 bucks!