I just passed the CPT exam last month and the CEH this morning after taking the online version of the InfoSec Institute Ethical Hacking course. I found the course materials to be excellent. However, for the CEH test, I also recommend studying the Michael Gregg book before taking the CEH. The CPT multiple choice was very easy but the practical took me several days to finish. Escalating privileges on the two machines was fairly challenging.

I am currently taking their Advanced Ethical Hacking course and am about 1/2 done. I don't recommend it if you are not a programmer. I have been programming for over 30 years so I am really enjoying the course.

I am taking the GIAC GPEN test on Monday. I took one of GIAC's GPEN practice tests and did really well on it. Just have a few things to brush up on. There is a lot of overlap between CEH/CPT and GPEN.