I always use International Signed For, when sending overseas. I learned the hard way, originally selling standard airmail, and got diddled by several people ("items not recieved")... Once I upped postage to "International Signed For" regardless of the price being higher I have still been getting the same percentage of overseas sales, and although a few people have tried to claim "not recieved" as soon as I would input the tracking and find that they had signed for it, it nipped that in the bud. Even in the UK, unless something is mega-cheap, I far prefer to send Signed For.
Interesting, I just had a biiiiiiig sale to China too...