I live in a town house and I just bought a new speaker set.
You my think 70 watts of power isn't much, but I have them hooked up to my computer and there AMAZING!
My computer room is about a square room 12 feet by 12 feet and I have my volume nob turned not even past the 50% mark and it's loud.
My set up is more like a center speaker with the two left and right front speakers next to that. Then the back speakers I use as side speakers really.
The sub is under my desk and it's great!
I was also considering the G51 system and this system is all you really need. It's a loud
cheap 5.1 channel speaker system with sound quality to rival the pros.