I have a Western Digital SharedSpace NAS and could not be happier...no idea about the power consumption issue but it is expandable, feature rich, etc...the url is http://www.wdc.com/en/products/products.asp?driveid=500 noting that the smallest is 2TB so this might exclude it from your search...

Audio: Triad Monitor Golds, Surround Golds, Silver Subwoofers; Procella P-18 Subwoofer; QSC DCA 16622s, 1644, 3422, BASIS 922uz; ADA MACH IV B
Other: APC S-15s; Crestron
Sources and Video: Ran out of characters .....................