Let's try it the other way around since this seems to be too complicated for you.
What Hardware and OS would you suggest to fulfill the following tasks:
- stream video files from a NAS
- stream audio files from a NAS
- stream webradio
- play YT movies
- HDMI output
- play popular casual games
- play DVD/BluRay (either built-in drive or attach via USB)
You can achieve this cheaper with ARM/Android combination than with any x86/x64/Win/Linux combination.
It's 50" and Zotac has some nice looking HTPC's in their portfolio. This would also be the competing product class, btw. And there, a ARM/Android device would have good chance to take the lead due to it's lower price and the available apps, nothing Win nor Linux could compete with.What is the definition of "optically" in the context of this device - the casing isn't up-to scratch with the design of your 60" TV?