The most suitable option for the financial organization mentioned in the question is Private Cloud. This model provides the necessary control over data and infrastructure that a company subject to strict financial regulations would require. It is designed to handle sensitive data with high levels of security and offers the potential for future integrations with other services, which could be part of a Hybrid Cloud strategy. Community Cloud could be considered due to the shared compliance requirements, but it wouldn't offer the same level of control and data sovereignty that a Private Cloud offers. Dedicated Hosts on a Public Cloud provide physical server-level control but may still fall short of regulatory compliance requirements and don't offer the same degree of customization and control as a true Private Cloud.