Thank you Palash. Considering my needs I resolved to develop my own plugin. I offer it here as well for those that are interested.
Features:
-WordPress User Registration Integration
-Uses IEM XML
-Map each user type (Subscriber, Contributor, etc) to different contact lists
-Map ALL WordPress fields to custom fields in IEM. Not just First and Last Name etc.
-Unlimited installs/WordPress sites.
More info: http://www.iemaddons.com
Thanks,
Jacob