So you've had good results with the speed chain? I've heard of it but don't know much about it.
Yes, I have had good results with them - both personally and with patients/clients. I don't have a specific DVD to recommend because the ones I have seen are OK but are very basic, very general.
And now the spiel again- If possible it would be good to have at least one to two sessions with a PT or Chiropractor or Trainer specifically with the golf swing in mind. The goal is not to get you hooked in to seeing someone for 20 visits but would help you focus on what you should be working on. Where are you tight/weak etc. Everyone has something they should be working on. You want to spend your time in the most efficient manner.
The more flexible, strong you are then you will be able to better implement the instructions from this site.
CG