From: South Carolina, USA
I just finished re-reading Guderian's "Panzer Leader", which I read many years ago, and was reminded again how good a book this is. I remember that the OOB charts of the Panzer units in the appendices were a big favorite then, as all the games available to me had counters representing divisions and higher. This would have been "Tactics Two" days perhaps, with perhaps "Stalingrad" or "D-Day" as new games. I had not seen a tactical game yet. Guderian is important in a special way because of his access to Hitler, and the interaction between them. I do not think I ever read "Achtung Panzer" but it would probably have plenty of theory as it was written before actual panzer operations. In "Panzer Leader" a lot of space is taken up by day-to-day operations in Poland, France and the USSR, which is great for some situations, but can be dry reading if your focus is not at an operational level. Guderian is a primary source for the controversy over the decision to take Kiev before Moscow in Fall 1941.
"Panzer Tactics" is not a bad read, but it is not in the class of the bigger memoirs you included. I have "Lost Victories" on the table in front of me, but scheduled behind a couple of other books. Don't forget the public library, and perhaps interlibrary loans, for some of this reading where ownership of the books is optional.