The best user interface and ability to play everything is Plex. Get an Apple TV gen 2, jailbreak it and install Plex on it. Install Plex Media Server on your computer and you are set, you won't be dissapointed.
If UI is not a concern then WD TV live or the ASUS O Play will work as well.
If you want no hassle 1080p, build a HTPC
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