I am using MC as a DLNA server to send media to TV & hi-fi etc, via DLNA Renderers that are attached to the TV & hifi (WD TV Live). Control is via the PlugPlayer DLNA Controller app on an iPad. Therefore the TV does not have to be on in order to play music.
The bit of the equation that I haven't got is the use of MC as a client itself, using its own interface on the TV. for this, obviously, you would need to connect your PC to the TV, then you will have full control over MC's Theater View interface. Whether it does info lookup etc to the degree you want, I don't know as I've never looked into Theater View and MC's client facilities in general.
If you have MC connected to the TV, then you obviously don't need a DLNA device to play video and music to! You would use MC itself to render on the TV and would connect the audio outputs of the PC to your amplifier. But you can have independent zones, which may be other PCs running MC or they may be DLNA devices around the house, which you can still control via MC on your main TV.
My media files are currently on the PC that MC runs on but I soon hope to get a NAS unit to put the files on. this should work transparently, where the files are stored on the network doesn't matter.