While there are some thousand boxes out there too many use a TORRENT video sharing system and that creates problems for users that expected that to work. No one can support you on that so this is where you learn this now rather than dump close to 100 bucks into a dead end box.
Now if you want to play videos off some HDD then any of them that have VLC Player seem to be nice.
Hi! I want to buy a Linux TV Box. Who has it? What model should I choose?