Chromecast may not be your best bet. If I understood what I read, when you stream from your computer, the stream is sent to one of Google's servers and then to the TV. If you play a 1 GB movie, you use 2 GB of data; 1 GB out + 1 GB in. Ie, Chromecast was designed to stream video from the 'Net. But I'm just going by what I've read.
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