You could go for the Pioneer HTP-071. (Around £250)
The setup would be HDMI-->Receiver-->TV I'm sure.
It also means you could plug in a Blu-ray player, PS3, Xbox 360 into one of the other 3 HDMI inputs.
It's 5.1, 192 kHz / 24-bit...
Here's a link to the system specs:http://www.pioneer.eu/uk/products/HTP-071/print.html
This would mean you wouldn't need an optical cable, as HDMI deals with audio as well.