develop new corporate identity, logo and stationary

We require a rebrand/new corporate identity for our expanding company. Our current operations include real estate sales and portfolio management, project marketing and investment advice. We have recently launched a migration firm and plan to include financial planning and mortgage broking in our repertoire in the future. For this reason, it is important that the brand can have a common theme or appearance across these varied professional services. Our existing branding is basic and we require a more sophisticated image to ensure we get the best return on any future advertising spending. We require a designer that will work with us throughout the process to ensure our values are reflected in the brand. Preferably we would like to work with someone who has experience with branding and corporate identity for professional services with a thorough understanding of relevant conceptual material.