What Version Should I Buy?

I was wondering, which vesion of Diamond Jubilee or Centennial should I buy. I can only find the college version of Centennial, and I am a beginner, and there are so many versions of Diamond Jubille, I do not know where to start. I was thinking, If I choose Diamond Jubilee, should I start with the Functional Method? I have to idea. Thanks in advance.

(by slowshorthandlearner for everyone)