Spanish – how would CM do it?

I am still mulling over how to approach foreign language. We have been watching Salsa Spanish on occasion, but only the younger children like it.  I have wanted to buy the Cherrydale Press resources for such a long time and it is now on my priority list for school purchases for the fall.  So… What do I do then?  I will use it as is with the younger set of children. But my oldest daughter as well as a niece and a nephew will need some high school credits.  I have almost decided to use Breaking the Spanish Barrier with them.  All three will be with me three times a week for instruction and I could give them written assignments from BSB on the other two days.

I guess what I am asking is could the Cherrydale resources be used with high schoolers?  If so, how?  And would I need to add another resource so that grammar is covered? Pretty sure that I would. This is a bit overwhelming.

Our library has the Living Language Spanish book/cds but I haven’t looked closely at them.  I keep forgetting to ask about Mango.

Thank you for any help!