Make sure you get a NAS with a good operating system on it, one that runs a torrent client so you can just download directly to it.
As for the media players not too sure what the samsung smarthub looks like or is to use, maybe try it out if its annoying buy a media player for it, other option is one of these things:
http://www.scorptec.com.au/computer/48537-boxdc3217by
And if it were me I'd probably buy one of these to control it (~$45):
http://www.logitech.com/en-au/product/wireless-touch-keyboard-k400