I'm leaning toward adding:
Ken Webber – Maximum Entertainment ($40)
This is a great idea, and you've provided a great starting list. I would definitely suggest that Ken Weber's book belongs on the list. It's been recently released in an expanded and revised version, entitled
Maximum Entertainment 2.0.
As an alternative to Weber's book, one of Darwin Ortiz's books would be a great addition.
Strong Magic focuses a little exclusively on card magic, so
Designing Miracles would be my recommendation. Like Ken Weber's book, it focuses on what makes magic so impossible and powerful, and deals with many aspects surrounding construction and performance of magic. These are the books that have single-handedly improved my magic the most.
I like the books you've selected for card magic, and the ones you've chosen are inexpensive, so I can see how you can include several of them. But I wonder if perhaps just a single more modern book would make more sense rather than three older and less current books. Something like Roberto Giobbi's
Card College 1 & 2 (although this would probably blow your budget), for example, or even one of his
Card College Light books.
Giobbi's
Roberto Giobbi's Introduction to Card Magic is readily available as an ebook, and only costs 6.95 euros, so that would be a really good option. Check out
my detailed review if you need convincing about why it's so good. I highly recommend it, and it would be ideal for the kind of course you are suggesting.