Nothing really. I don't have any speakers that I can plug into a PS3, but since I'm half deaf it's not a huge deal.
Though for the few things that don't have subtitles, any suggestions for audio would be appreciated..
We can't help if you don't have the hardware. You require:
1) An HDTV, or
2) A monitor with speakers (and HDMI input)
3) A monitor with HDMI input and audio output (to attach to desktop speakers)
4) A receiver that can connect to the PS3's digital audio output