Deloitte is a possibility of course for audits similar to traditional financial services companies, but then the issue arises around their expertise regarding the Bitcoin protocol, software and security practices of which they would have no clue how to handle.  There may need to be a hybrid approach, or perhaps an entirely new compliance organization started with Bitcoin developers and security experts.  As an example of such an individual, Andreas Antonopoulos recently did security checks for companies like Coinbase and Mt. Gox.