Hi mate,
I have ordered a 17" MBP and have got applecare with it but as you know this doesn't cover accidental damage or theft. I also intend on getting separate insurance which will cover this...
Either get it as part of your home insurance (make sure the cover includes taking the notebook outside) or get third party insurance.
The best place to get it insured is with a company called 'Domestic Insurance'.
They are the same guys who High St retailers such as Comet, Currys, PC World, Carphone Warehouse etc etc use, the only difference is you cut out the middleman and don't pay nearly as much as they charge in store.
I'd recommend giving them a call and getting a quote. Whilst you're there also get a quote with your mobile phone, TV, gadgets and stuff included. It may only be slightly more expensive than if you were to get insurance for the notebook alone and that way all your cool possessions are covered
Hope this helps.