DS is now in 1st grade, and reading on ~3rd grade level. If you were to see DS while he's reading, you'd never guess he has ADHD - so still & focused! Books have been a blessing for us.
We focus on classics too. I'd rather explain anachronisms than teen love stories. In addition to some that were already mentioned, CS Lewis, EB White, Marguerite Henry (on a horse kick right now...), Madeline L'Engle. Also tons of non-fiction (go to your public library).
FWIW, DS is at a MoCo public school and they have just changed the way homework is assigned. We LOVE it! Notice goes out once a week with ~10-12 options. Child needs to do 8 of them (each very, very do-able within 10-15 mins. independent of parent supervision, ie. look at a magazine article and pick out the prepositions, or web-based arithmetic puzzle games, etc.) over the course of the week, including the weekend. Parents just initial to check off what was done and send the sheet back in on the designated day. The choice and flexibility has really helped. There's plenty of time for free reading, or whatever else.