I wanted to use the coco coir, but I couldn't find it locally (I live in the boonies). Maybe in KC or St. Louis, but that's about a 3-3.5 hour drive. I had just assumed shipping would be a lot of money for how much I needed, so I went with the peat moss.
I mentioned to the wife about returning the peat moss and ordering some coco coir, but she was not super thrilled about that. She doesn't approach hobbies the same way that I do (I tend to obsess), so she has a hard time understanding why I'm so concerned with pH and such.
Anyway, she vetoed it, so now I've got to move forward from here. I've read you need to rehydrate peat moss before you use it, and my well water is incredibly alkaline, so I'll probably mix it up, test it, and go from there.
My neighbor gave me a pamphlet written by some local guy. His grow mix is basically 1/2 compost, 1/4 moisture retainer, 1/4 compaction preventer. The peat moss is for moisture retention. The mix will mostly be cotton burr and mushroom compost, and I'll probably pick up a sack of rice hulls the next time I'm at the brew store to prevent compaction.