I've been on the exact same search.
Yamaha makes some receivers with low standby power. Google "yamaha receiver eco friendly standby" and peruse the various models. They claim to use a fraction of a watt on standby. I'm not sure if you need to switch them to standby or if they do it automatically when no sound is detected.
Creative also markets some of their computer speakers as being Energy Star certified, although I can't find any evidence that there is any such Energy Star program, nor can I find specifics on how much standby power they use. But would such a big company lie about a certification? I dunno. Anyway, search Amazon for "creative energy star speakers" to see them. I've been using a set of 2.1 computer speakers on my TV for years. They usually just have a 3.5mm male plug that you can connect to whatever. Not sure how the 5.1 ones connect though.
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