My idea is to read whatever I can as fast as possible without missing the main idea to come back to the ones I deem better later on. I still played almost half the positions in those books on a board on ogs.
I read the following in listed order:
1- River Mountain Go 1
2- A Go Guide from a Beginner
3- 81 little Lions
4- 2nd Book of Go
5- Opening Theory Made Easy
6- River Mountain 2
From these 6, I definitely recommend RMG 1 and Opening Theory Made Easy.
This month, I am reading Direction of Play by Kajiwara, Lessons in Fundamentals by Kageyama and Shape-up(10kyu course). Lessons in fundamentals is an especially fun read, with Kageyama drifting off to vague baseball analogies and impertinent memories from his childhood.