When I first posted the book selections for the literature portion of the US2 guide, I answered these same questions. So, I will repost my thoughts below for you to ponder.
My thoughts would be that classics such as Pride and Prejudice and A Christmas Carol bear re-reading. My own boys listen to a fully dramatized audio of A Christmas Carol every Christmas as they set up the Christmas tree. They never tire of it and look forward to hearing the story each Christmas no matter what their age!

As far as Pride and Prejudice goes, there are entire book clubs devoted to being a fan of Jane Austen and a chronic reader of her works! Many in the clubs can recite her work verbatim from so many re-reads.
In looking at these books from a Heart of Dakota perspective, we originally scheduled A Christmas Carol in a DITHR book set that the students would have read 5 years ago, and we originally scheduled Pride and Prejudice as a girl option for the ladies to read three years ago. So, with years like that in between the readings, I would think there would be much to gain by a reread of such well-known classics as these.

Additionally, reading the books along with the daily plans that we will have in U.S. History II will draw things out of the reading that the students may have missed even if they have read them before.
Of course, should you desire to replace the books with your own selections, you could easily do so. We definitely weighed the options when making book selections for British Literature and felt the balance of the selections that we ended up with was best for students overall. Books like A Christmas Carol and Pride and Prejudice are just too important as classic works to be missed.
Blessings,
Carrie