Passed the SSCP exam earlier today

. How much more difficult is CISSP than SSCP? I'll start reading/studying next week. I'll begin with the CISSP Boxed Set (AIO and Practice Exams) by Shon Harris and the CISSP Study Guide by Eric Conrad. Those two seem to be what's most recommended.
Also, is it beneficial to get the CASP cert now that I have SSCP?
Thanks