Media Streaming from a second Media streamer

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I am looking to get a second media streamer and want to know how I might link it in with what I have. I currently have…>>

Home Cinema Room: Have an Samsung LCD tv with a KEF 2005.3 5.1 surround sound system. In a walk in cupborad in this room I have an Arcam DV135 and AV Amp. They are linked with an HDMI and Optical digital lead through the wall to enable surround sound from the TV. This is more a film room.>>

Kitchen: wireless N router Broadband connection from Virgin >>

Sitting Room:  A second LCD and some mid-range Hifi separates form the early 90's (Marantz, Kenwood and Tannoy kit) and a La Lacie Classic HD (1TB) with a ton of movies and music on. This is more a of light TV watching and listening to music room.>>

I want to get the Home Cinema room linked up to be able to watch films that are on the La Lacie HD. I believe I need another media streamer. I was thinking I would put the La Lacie in the Home Cinemas Room cupboard so I can watch the films and buy a Boxee Box for the Sitting Room and stream music contained on the La Lacie. ( I hear the Boxxee Box is a good streamer for getting music and iPlayer, and the La Lacie whilst having a 1TB HD apart from Flickr has no apps for streaming web content).>>

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Does anyone know if this is possible to do and what I need to do to setup / or have any other suggestions to achieve the same / similar effect? >>

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Thanks>>