OOOOOOOkay because noone answered me I decided to just stay up till I get all my answers in order and may be now I can help someone ! Here are my original goals and setup.
I have AMD HD6970 GPU (1x HDMI, 2xDVI and 2xDisplayPort version) I have 2 Monitors connected to computer VIA DVI ports, Pioneer AVR 1022 and finally Samsung 55' HDTV (UN55C7000)
My goal was to add Home Theater function to my Personal Computer so I can work on my 2 monitors and as needed watch HD and HD3D mkv movies on my 55' Samsung.
Here are problems I came up with.
1. I could not get my TV to be shown as 3rd active monitor
2. I have MKV files with HD Master Audfo 7.1 track and my AVR could see only Core DTS (5.1) and not full DTS-HD
Here are solutions.
1. 3rd Display.
You simply can't do this with DVI + HDMI. You can get DisplyPort to DVI adaptor but all this will do for you is you'll be able to attach 3rd Monitor and as we all know DVI does not carry audio signal. So at this point there is a way to get 3 monitors yet without audio so my best advice is this. When you have movie night simply have your AVR connected to you GPU via HDMI and when you do need to watch movie disable one of your monitors and do mirror image you TV and you other monitor. So by the end you'll have 1 disabled monitor, 1 working monitor where you can control PC and TV that showing exactly what if going on on your monitor including movie you wish to watch,
2. No HD 7.1 Master Audio sound on my AVR.
This was simple and very very annoying. I installed XBMC and I WISH someone told me right away that "Hey buddy in order for you to get HD audio you first need to intall this little file that will enable HD audio in settings" but anyhow beside XBMC you need to install HDAudio + Eden RC2 file that can be founf here: https://github.com/DDDamian/xbmc/downloads
it's the last file in there
Quit XBMC and install XBMC-RC2-HDAudio.exe that is located inside XBMC-RC2-HDAudio.zip file. Now once it's installed go to Audio settings and BOOM you'll see options for HD Audio ...... damn I wish someone just told me this thing ....anyhow I hope I helped.