I think you need to be thinking longer term and looking for a structure that best suits your needs and your lifestyle. Quick and cheap shouldn't really factor into the equation.
In Hong Kong you need to file audited financials yearly. The so called 0% tax setup that a few people parrot in these parts still requires you jumping through hoops every year with the IRD. Additional cost and headache and not worth it.
I've never seen any real issues dealing with the IRS - that's not to say that it doesn't happen - but you structure things so that should anything occur you're insulated. The main reason why I like the US setup, is access to merchant facilities. The LLC just acts as a payment processor and the bulk of the funds are wired offshore every couple of weeks. The US can be a very tax-efficient structure for foreigners.