I have reading habits similar to yours, and own a Glo HD and the first version of the H2O (same resolution as the H2O2). I cannot recommend one over the other because I've never even seen the Clara, but what I can say is that the difference in resolution between 300ppi on a 6" screen and 265ppi on a 6.8" screen is unnoticeable to me. You might need to set a higher refresh rate on the H2O if you want your text to look crisp at all times, but that had barely any impact on the battery life of my H2O, so it shouldn't be a problem.
Also, besides the Comfort Light and the added storage there's not much difference between the Clara and the Glo HD, so if you still own one the upgrade might not be worth it -- at least with the H2O2 you get a bigger screen.
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