Please Help!!

[Glac1030]

OK so I know there are numerous threads out there debating the specifics of this issue but none cover my exact situation. I am trying to get the best audio from my PS3. I use a HDMI cable to go to my tv and then an optical cable from my tv to my receiver. The problem I am having is how to go about this whole PCM or Dolby Digital ordeal that so many tend to deal with. Which do I pick on my PS3? LPCM or Bitrate? The reason this is so different for me than the other threads i've read is because I go through my tv to get to my receiver which I do because I have multiple HDMI hookups and it is much more convenient. Also my TV has a setting for either PCM or Dolby Digital to make things even more complicated. If it helps my receiver is a 5.1 system capable of most decoding (not extremely high end but a good receiver, just doesn't have hdmi inputs only optical). Please help on what settings I should choose