|I am not exactly sure what you are looking for.|
My Samsung LE40C650 play movies with a hard drive plugged into it's usb port.
It has a network connection, but you would need a media server, this will transcode avi's into a file that is playable on the tv.
You could look at a Media server like Serviio http://www.serviio.org/ freeware
Or wild media server http://www.wildmediaserver.com/ not freeware
These mean you play files from your pc, via your network.
Or you need a network media player like the WD one's
Or popcorn A200 or Mede8ter or HDX or Asus Oplay
A thank you would be nice, if I have helped.