I bought the 7 tests. I would recommend it if you are psychotic and/or want to do as much practice as possible. I also bought CDP which was ONLY PAT and it cost $130. For $10 more you get 3 less PAT tests but 7x more of the other subjects. Of course if you don't think you will have the patience to wrangle with Achiever, then only get the 3 test version. FYI Achiever is extremely difficult and a lot of people dislike it because it is confidence shattering.
Technically 3 Achiever and 3 top score are what most people do. I did 7 Achiever and 3 top score and I would have done the same again if the chance arose.