I noticed a couple of trends in the last few years.
Surround Sound Add On
An additional amp with at least five speakers. Each corner of the room would get the compact speakers. Most would follow the instructions and put the loud woofer in front which leads to most sound coming from the front. I would at least put that woofer behind the couch and if the TV has decent speakers, keep them on as well.
Sound Bar
This seems to be the current trend to cut down on all the extra speakers spotted thru out the room. The problem is all the sound is blasting from the front of the room which is plain silly. That Sound Bar should be placed back by the couch with each speaker separated and placed at each corner.
My old Stereo
Hooked up to the TV audio out to my Aiwa aux in, for me more this is more then adequate. Two speakers, placed up high of the couch on each side facing towards each other. This complements the HD CRT which has a "Bose Reflect" third speaker built in it. The sound has proper separation, when something happens on the left of the screen, the sound is on the left as well as the front. When both channels are used in a scene, you are literally "surround sounded".