Raspberry Pi Review
For enthusiasts on the cheap, a Raspberry Pi can be a great option. At $35 and 45 grams, nothing can beat the price and portability. With the strong community behind the Raspberry Pi, there are plenty of easy, step by step tutorials for easily installing media center software on it.
With the price as cheap as it is, it's very feasible to have a different Raspberry Pi for each of your devices.
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A lot of Media Center OS to choose.
Pro Not just a Media Center
You can use it for surfing the web, play retro games, and host your own.
Con Lack of 4K support
The max video output is 1080p.