Asus Xonar D2X (112£) or Creative X-Fi Titanium Fatal1ty Professional (90£)
Needs:
Toslink (Optical) or Coaxial output to connect Logitech Z-5500
DTS or Dolby Digital Live Encoding for Logitech Z-5500
Great Analog Sound for Sennheiser HD555
PCI Express 1x
Budget:
120£
Site to choose from:
Scan Computers UK: Computer Hardware - All - Sound
Needs:
Toslink (Optical) or Coaxial output to connect Logitech Z-5500
DTS or Dolby Digital Live Encoding for Logitech Z-5500
Great Analog Sound for Sennheiser HD555
PCI Express 1x
Budget:
120£
Site to choose from:
Scan Computers UK: Computer Hardware - All - Sound