[quote user="onthejazzin77"]
Is the DAV-DZ830 any good? i.e. will it mean I dont have to buy an upscaling dvd player?
Also could I connect my sky and ps3 to the DAV-DZ830? or will I only get 5.1 from watching dvds?
[/quote]
Yes, the DAV-DZ830 has built-in upscaling, to 1080i.
But although it has two digital inputs, one's optical and the other's electrical, so given that both the PS3 and Sky HD have optical digital outputs, you're not going to be able to use them both unless you swap cables each time, or invest in one of these,

which is a three-in-one-out optical switcher, or one of these,
which is an optical to electrical digital converter you could use between one of the two units and the electrical digital input on the Sony system.
Consulting Editor, What Hi-Fi? Sound and Vision / whathifi.com
Audio Editor, Gramophone