Hi, welcome to the Forum.
We will need a couple more questions answered before trying to help, and since many of the responders to your questions will be North American, we will probably blunder along with equipment brands and models that might not be available to you.
What are your speaker preferences....stand alone "in-room" speakers, in-wall installed speakers, a mix of in-wall and in-ceiling (please, do not consider all in-ceiling units, unless you want to mount your screen on the ceiling and lay on the floor to watch it

). Large, medium or small physical size for the speakers.....WAF ? (wife approval factor)....
For the a/v receiver, what will your sources be, is HDMI required or wanted, do you want to use the new lossless HD audio codecs and Blu-ray HD-DVD's ?
What HDTV or projector/screen are you considering ?
well, that's enough of an overload for now....