I don't know why you'd want a 300SD manual, that is a different chassis car. Out of those I would take the printed factory manual hands down, I have all three manuals but don't use the chilton's at all. I have the haynes in the garage, just for torque values. Most of the time I have to get them from the factory CD manual though. Those can be found cheap but the printed version would be so much better.
I guess you got me back leathermang, one minute.