After Foerster Alg II...Shormann, Mr. D, Derek Owens, help!

[ofthevine]

My son would like to go into the medical field and has been successfully using Foerster textbooks. He will soon complete Alg. II. 

The thought is to move onto his Precalculus book, but I can't offer a ton of help and the Math Without Borders videos don't seem super helpful, but that could be my boredom speaking. 😆

We're also looking at Shormann, Mr. D Math, and Derek Owens (though it seems much more expensive...or I have to grade myself). 

Thoughts on any of these programs vs. Foerster? Should we just continue with Foerster? Do the other programs offer enough rigor? Will the spiral nature of Shormann drive us nuts? Is Derek Owens really worth the cost? 

 

[EKS]

Derek Owens's precalculus course is excellent.  It prepared me very well for the work I did for my bachelor's degree in math (see sig).