Want to throw in my experience, for any of those out there considering this. I have an 8 bay NAS. My needs were pretty simple, something that could play any media direct play (no need to stream to tablets or phones).
For those needs, the Odroid C2 has been awesome. The process was very simple, Charles and many in this community hand held me through the process. The price is right. If I were starting over again, I would definetly go this route.
For those looking for a cheap option for media. I would get the cheapest option to serve as a file folder and the Odroid C-2 as the Media client.
Any of those interested in seeing how my search went can look up a separate thread I have on here (don't have too many.)