I'm getting ahead of myself a bit since I am only on Lesson 4 of Athenaze.
But over the years I have collected a few Greek books, and I am curious which I should tackle first as I am learning how to read. Here's what I have:
Passages for Unseen Translation, by Cook and Marchant
Greek Literary Papyri 1 Poetry (I'm assuming these will be difficult)
Loeb edition of Marcus Aurelius (Meditations and some other ...