looking for any advice please, I am wanting to get a decent surround sound set to go with my PS3 and SkyHD which I assume outputs good sound quality, 5.1 would be suffice, so assume I just need an Amp, Sub and the 2 fronts and 2 rears (please correct me if im wrong, bit of a novice) ideally for under £500, any suggestions would be greatly appreciated, Lee