Builders delivery methods

Design Build - The design build method is a single source contact for the owner. The owner contracts with the design build firm for all services and in most cases the whole package. The architect used by the design/builder represents the design/ builder not the owner. Design Builders may not give a good dollar value for all the accounts because he has to make a certain amount of profit and overhead on each account. There is no volunteer labor from within the church allowed in most cases.
General Contractor - This method is the oldest form of building delivery. The architect does represent the owner. The lower bid gets the job in most cases. In some cases the owner may negotiate with a general contractor to build.
Construction Management - The Owner, Construction Manager and Architect work together during all phases of the project. Experience and resources can be utilized during all phases of the project to provide the most economical building consistent with the owner's requirements. The owner accepts most of the risk on the project, but the contractors and designers have ethical and reputation standards. The architect may be the construction manager. As well the construction manager can be the architect.
Cost Plus - These contracts are one of the other options for owners if they desire to free up designers and contractors to perform at their best. Owners must be able to trust the designers and contractors to keep the costs down to a minimum for their project to be successful. The owner needs to establish early in the process what is included in the cost and what percentage will be paid for changes over the cost. No blank checks should be allowed.

What type of builder's delivery method should our church choose?