APC recently introduced a series of power conditioners specifically designed for audio/video applications.
Their "S" Type AV Power Conditioner with Battery is pretty much exactly what you are looking for: "Pure sine-wave battery backup, surge protection, isolated noise filtering, and voltage regulation all combine in a single unit to deliver pure, uninterrupted power for high performance AV, home security, and automation systems."
I have been running its little brother - same without the battery back - since November and am very pleased with it. The system sounds very, very good...
http://www.apc.com/products/category.cfm?id=15&segmentID=1
Their "S" Type AV Power Conditioner with Battery is pretty much exactly what you are looking for: "Pure sine-wave battery backup, surge protection, isolated noise filtering, and voltage regulation all combine in a single unit to deliver pure, uninterrupted power for high performance AV, home security, and automation systems."
I have been running its little brother - same without the battery back - since November and am very pleased with it. The system sounds very, very good...
http://www.apc.com/products/category.cfm?id=15&segmentID=1