We have a requirement to periodically update a set of contacts in the CRM from an external source. Our preferred base technology is Drupal migrate. This is so that we can automate some transforms and the user can trigger the imports as well as review the results. It's also so that we don't run into the performance limits that we typically do with the CiviCRM import procedure.
Which module is the best option for creating the CiviCRM integration?