Media center with a through put of 20 MB/s

I am trying to create a NAS but I want to run my own software on it. I want to be able to download data around 20MB/s over wifi from the system. I used a raspi and created a prototype, but as it uses a single bus, it is not able to transfer data from the hdd to the user at the rates i am talking about. Any body know any build that suits me? Need ur suggestions.

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