mattwnz: Sometimes the extended warranty provides less protection than the CGA too. eg. one I purchased said they would only payout the price the device would be worth now, and it was at their discretion whether they replaced or refunded(but not a full refund) .
From my experience it is just as much of a hassle making a claim under an extended warranty, as it is under th CGA. However under the CGA, however if the retailer provides you with incorrect information regarding the CGA (eg something wouldn't be covered when it would be), they could be breaching your consumer rights, and I believe they can potentially be fined, but not heard of that ever happening.
They CANNOT contract out of their obligations under the CGA. So regardless, you are covered by the CGA.