Also, here's a tidbit about Plex for the Roku: http://www.ehomeupgrade.com/2011/05/04/plex-for-roku-now-available-via-private-channel/

It is spectacular, and has handled every codec I've thrown at it so far. There may be something similar for your Sony in case a DLNA solution isn't handling those critical torrent streaming needs... (*cough* Top Gear *cough*).