Ok, well first off, a DMD is a dual mass damper or I think I've also heard it called a dual mode damper. It's a crank pulley that has two different vibration dampers on it. (sorry for the semi poor explanation) one set dampens low end vibrations and the other dampens the high end vibrations. Basically it makes the engine run smoother and can go a long way towards saving the engine form the crank whip the V6 is prone to.
As for the strut tower braces, some say that they're not really needed on the front of our cars due to the relative closeness of the towers to the firewall. That being said, i have an OMP brace in front and noticed a slight difference in handling, key word slight. As for the rear, many people, including myself, have put in rear braces and had a pretty noticeable change in handling. I have the HPP brace, but since Hightower closed shop I don't think you can get them anymore, I'm sure others offer rear braces, but I'm not sure who. Hope that helps, and if any of my information is inaccurate someone more knowledgable can feel free to correct me.....like you need permission right?
