Is constant contact a good fit for this use case.

We are going to run queries against a large SQL database to collect customer info for particular event driven email campaigns.

Examples would be all new customers would get an email with an offer if they come back again.  That same customer would never get the new customer email again but they will get other event driven emails that will not be sent to the other people in the list they originally listed with.

With Constant Contact being powered by persistent lists is there a way for me to efficiently do want I want to do?  Can I just create and destroy lists for each event driven campaign, send the emails, then destroy the list since  that list will only be valid for the context for which it was generated?