Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.
I'm in exactly the same boat as Stealthy here... My entire media collection (TV, Movies, Pictures, Music) is available in real time to every TV in my house, direct from my PC. I have never researched a media centre box basically because everything is so easy to setup and stream I can't see the point. Hence my confusion about why people need media centres.
I have a 37in on my wall, my dad has a 40in in his lounge room, and a 32in in his bedroom All linked to my PC and ALLLL the media on it. You just watch it like you would play xbox game. So yes, it does have TVs
Can media centres even be shared across multiple TVs? IDK how they work (and tbh i havn't researched it, since my setup works so perfectly)
My PC has a dual HD recorder, so it does what a normal media centre can do, times 100 (media centres are limited in size, i doubt i'll fill 14TB anytime soon...)
DLNA only? Are you serious? That's one of many many protocols used.
As for 3D - LOL!!! Over hyped gimmicky crap! Who wants to have everyone watching TV wearing large uncomfortable glasses?
Please keep going - I haven't heard any benefits of your setup over mine just yet. Unless a goal was for it to cost more. Then I guess that'd be a plus. But that wasn't a goal of mine.