If I'm not mistaken the USB port on the gateway is strictly for use with a computer without a network adapter.

I was not aware they had USB over powerline adapters, but I know they have ethernet over powerline adapters.

As far as what's better for streaming, IMHO a wired connection is always going to be better than wireless.

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How can you be in two places at once, when your not anywhere at all?
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I really want to become a procrastinator, but I keep putting it off.
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There are three kinds of people, those that can count, and those that can't.
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“Our great democracies still tend to think that a stupid man is more likely to be honest than a clever man, and our politicians take advantage of this prejudice by pretending to be even more stupid than nature has made them." :Bertrand Russell