I'm interested in hearing comments about algebra options as well.
I did just buy "Painless Algebra" by Lynette Long, whose praise I often sing for her "Painless Geometry" that I used with DS7 last year. It was cheap-cheap at the Scholastic Books Warehouse sale going on now for teachers and homeschoolers at warehouses all over the country, and I actually squealed aloud when I spotted it.
But that's just a place to start next year (or maybe even this summer if he wants math this summer). It's not going to be sufficient.
Watching with interest...