[Zope] ZODB vs Relational Databases

Please forgive me if this is in a FAQ somewhere. I am writting an application that will be capturing financial information. If I use the ZODB and create expense and income objects to capture this information there will over a 1000 objects added a week. I will be tracking history, archiving data, etc. Is Zope the right tool for this type of application or am I better off creating the objects that this data is associated (companies, people, properties, etc) within the ZODB and using a relational database such as PostgreSQL to track the higher volume financial data. tia, Mike