You only have two inputs so it wouldn't be too difficult to use the equipment you have. You can run DirecTV HDMI to the PJ and the optical to the receiver and do the same witht eh PS3. You just have to switch the audio to go with the video each time you want to game/watch a movie. I would just use the PS3 for movie viewing since it is almost certainly a better player than the HTiB option.
But what most of us do is route everything through the receiver and have the receiver do the HDMI switching. You are going to run into problems when you add even more component. Almost all new gen receivers do HDMI switching quite well and even pass through 3D.
What Jautor outlined is why everyone around here will tell folks to run away from most HTiB (some HTiB are actually upgradeable). If you want to introduce anything new or want to upgrade speakers, sub, etc you have to replace everything.