I need some home theater system help.?

All informations that you found are correct. If you use PS3 to play Blu-ray movies all you have to do is buy a receiver with DTS-HD MA and Dolby True HD decoder on board. Another option is you have to buy a stand alone Blu-ray player with 7.1 og multi-channel outputs so that you can use it with your Onkyo system to get HD sound formats.