Regarding the Bravia link on the Sony equipment. You may find that the harmony and the Sony do not play that well together. I have a Sony xbr4 TV, DVD and receiver and did have some problems with it.

The nice thing about the Bravia system is the one touch options. However that is why you buy a Harmony. And by having for example the Sony TV turn on the receiver and the dvd is the Harmony will not know they are turned on. And in creating an activity for "watching DVD" you will need to have the DVD device in it so the Harmony will also try and turn it on. This is a real problem if it uses power toggles instead of discrete power on and power off. I had this problem, but other helped me realize that even if your remote does not use discrete power the equipment will probably work that way.

Long story short: you may have some problems and if possible I would recommend letting the harmony be the controlling device.