When homeschooling for high school, I think it helps a lot to see what books other people use. High school books are expensive so you don't want to make too many mistakes since that can add up rather quickly. I've tried a lot of different books for the grade school years, but for the most part, my high school book choices have pretty much stayed the same; not just out of financial necessity, but because we've been pretty happy with them.
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We've used Mother of Divine Grace for Earth Science and Apologia for all of the rest of our Science courses. I really like the way the author of the Apologia books teaches. While each course is A LOT of work, the author approaches it in a very conversational way.
For both American History and World History we use the Anne Carroll books. I follow the MODG syllabus for American Literature/History because it ties both the history and literature together. I also like that there are workbooks to go with both of them. For World Geography we have "The Ultimate Geography and Timeline Guide". My student and I will lay out the program and determine what projects will get done over the course of the year. For American Government, I follow the A Beka program, mainly because it is very thorough and comes from a Christian perspective.
This subject is so important in our homeschooling for high school that I've written a whole page just about it. Check out my curriculum recommendations here.
For the rest of the credits (Fine Arts, Practical Arts, Electives, Phys Ed) there are no particular books that I've used over and over again. They definitely vary based on the student and the situation.
I hope that this has helped you to get an idea of what is available for your curriculum choices for homeschooling for high school. Like I said before, a lot of these books are expensive, so it helps to get good recommendations before you invest your money in them.