A lead enhancement module transmits to one or more data sources an enhancement list requesting additional data items associated with a lead record. The enhancement list may comprise one or more data bundles, each comprising indicators associated with one or more additional data items. A personalized data bundle may be created by each client listing those specific additional data items that the particular client would like to retrieve for lead records from the client. A default data bundle may be included in the enhancement list for clients that have not defined a personalized data bundle, or the default bundle may be included in the enhancement list in addition to the personalized data bundle. Various default bundles, such as vertical market specific data bundles, may be created and provided to the client for possible inclusion in the enhancement list.