Ok, a little bit of struggling with google sketchup got me here near to what my room looks like:
As you can see, in these pics, the carpet area is around 13x15/16 and total living room which includes a dining is about 13X28 something. My tv would be suspended on a wooden plank and one of the speakers would be mounted on to the plank. The area behind the plank is the foyer area - so the wall starts like a U shape from the plank and ends with the sofa. I have already setup the speaker points in my living room.
Now, how badly do you think would the acoustics take a hit in this kind of a room? with walls enclosing about 2 and three quarters of the room, does it make sense to invest big on a HTS? Is there a chance that I would be about 90% satisfied with the way my HTS would sound, given the fact that my room setup is less than ideal?