Been looking at one of these, have few questions after a long read of the thread

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My Plan is as follows....
Get the DVR version to allow recording of TV, and access to HD freeview.
Connect up to my QNAP 109 NAS drive with Ethernet over mains/powerline.
I run Twonky media on the NAS, as UPNP server, to feed my my music streamer in another room, so in theory the Playon should find it, and allow me to stream my FLAC music files to the lounge as well ?
Then do the same with with films, just tried MakeMKV, seemed to work fine on the PC. Would I need to run anything else on the NAS for the films to be found and streamed ?
Sound will need to come out the Playon via spdif into my Amp. So DD/DTS only required.
I've been anti things Apple, but getting tempted by a Pad (when the new one comes out) as I can control my Music streamer and Hi Fi system with some nice Apps, would be good to also control the Playon. Is this available ?
If yes could you then play the music files without switching the TV on ?
Can anyone see any flaws in my plan ?