I'm not sure why it needs to stream to multiple clients, given that you say you already have a server with Plex to do that?
I think you've misread what I wrote. I have no need to stream to multiple locations. We have one tv in the house, driven by the HTPC and the kids have Chromebooks for school work. If they eventually want to watch something in their rooms they can add Plex to their chromebooks.
I want a simple solution in the lounge which can access the server content, iplayer and netflix, with one remote and as few clicks as possible to get there. The only reason for DVB-S is my wife wants to watch Coro St but we can handle that with her Chromebook until TVNZ produce an app.
I dislike Apple with a passion but it looks like the tv4 does everything I need. The only thing I don't like is the UI. Mediaportal was great in that it could display our movies and dvd series in banners across the screen showing more than 4 at a time when browsing.