If you aren't really using your desktop much, that will be your best server choice. A dedicated NAS gets expensive real soon.
But if this is your gaming desktop as well, I personally would not do it. Get something like the Plug (on Kickstarter right now, I backed for one myself) and the new Google ChromeCast- 2 really tiny devices that can do pretty much everything for you provided you have a supported device (any basic laptop, android or iOS device).
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