| Re: Surround sound for PS3 Samsung HTZ310.
If you run HDMI from the PS3 to the TV, run an optical back out from the TV to the surround sound set to give you audio on normal TV/Scart inputs, but crucially up to 5.1 through HDMI.
At the £200 range unless you go second hand you aren't going to get anything amazing in a proper amp & speakers, so buy something like this and keep it until you decide you want to go for an upgrade. 
ʎɐqǝ uo pɹɐoqʎǝʞ ɐ ʎnq ı ǝɯıʇ ʇsɐן ǝɥʇ sı sıɥʇ. |