I am looking to purchase a Logitech Harmony Remote but I need one that is compatible with Playstation 3. Can anyone confirm theres works with the PS3? It would be nice if it was compatible with Playstation 2 also. I do not know much about the model specifics so what do you suggest? I would like it to control my HDTV, PS3, PS2, Receiver, Directv Receiver, and a DVD player. Can I just get by with the 550 or 670?