There's no ultimate offshore solution. Everyone of them has advantages and disadvantages. It depends what exactly you want to guarantee and what are you willing to pay for setup.
- tax rate/double taxation treaties
- anonymity and how easy or hard is to be raised and by who
- maintenance cost
- accounting obligations
- reputation, political and social stability of the country
You'll better make the right decision since it's your money. You don't gamble with such things.
My advise is to write all down on a paper and do your own research.
www.ocra.com is one of the best places to start.