Best wired solution to control an iMac from 2 other screens/KB/mice

Hi, I've got an iMac model 12,2  installed upstairs in my house and I want to be able to control it (use the OS and the data) from downstairs and from the attic, using a keyboard, a mouse a screen and speakers.
Both "consoles"  will be used to avoid having to change floors to get something from the computer or to keep contact with who I'm chatting with. The downstairs' console will used to watch TV (via streaming or a USB TV tuner), watch movies (from the computer's files), and play video games (from the computer or from a standalone game console).
I'm not fond of wireless solutions such as WiFi because they are harmful. It also cannot rely on internet because it needs to work even when internet is down.
The dificulty is that 9 meters of cables and audio are required but the iMac's miniDisplayPort only outputs DVI or VGA (which don't support audio, Thunderbolt being out of question).
The way it looks now I would have to use (for each console) a DVI cable, an USB cable, a jack/optic cable and an amplifier in front of each of these.
In your experience what would be a good cheap solution ?
P.S. I will choose the screens depending on the type of cables that must be used.

"In your experience what would be a good cheap solution ?"
In my experience good solution is not cheap most of the times.
You will need professional installation to works the whole thing right with all these amplifiers and cables.
You have to be careful with electro-magnetic interference and Video-Audio sync.
DVI is better than VGA but you will find it only in computer monitors. TV Set has VGA and HDMI mostly.
I'm not sure about optical audio length limits.
Jack must be "ok" (not high expectations) for 10 meters if you use a good quality cable.
Version 2:
Thing about an iPad or even iPhone app (if you have an iPad/iPhone) to use as a mouse and keyboard via Wi-Fi. .
Video and audio still needs cables unless you can stream from iMac to Apple TV.
You will need 2 Apple TV devices so it is not cheap either and maybe not to fast for games.
Message was edited by: cheonweb

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