Thanks for your advice kbmum and Kelly. It's much appreciated.

Although it is cheaper, i would like to think that there is a chance that i might get one or two nice pulls so i am now starting to drift away from buying a sealed case for POA Update even though it is cheaper.
I think that i would be quite happy with whatever cards i pulled out of a case...it's the number of cards that puts me off. It's the amount of inserts that i could get for the amount of money that i would be paying that scares me. The fact that i would pay all that money and within the case i could get a number of duff boxes with only one or no inserts.
At least with other sets, even if they are not any of the rarer inserts you are at least guaranteed to know that you will get a particular number of costume/autos/props in each even if it is a bit more expensive.
I think i might try and go for the Goblet of Fire update as i have searched uk sellers on ebay and at the moment OOTP boxes are thin on the ground, let alone cases. They seem to be non-existent!.