4-4 Questions

I have asked this question before - but I really didn't get the answere I needed. What are the major differences in the video series between The Joe Roman Split 4-4 and the C.W. Post series. What about the James Madison series? I hear they have different styles - but I want to know WHAT are the major differences. I am looking at purchasing -but- that's alot of money to invest out of my pocket and then find out it's pretty different than my philosophies. Not trying to sound cheap - BUT $$$ and my wife are two seperate matters, if you know what I mean!!
Thanks
msunderlin@hotmail.com