I have been tasked with looking for potential ESPs that my company can transition to from ExactTarget. For both pricing and feature reasons. (ET is great, however we may be paying for a lot of features and functions we have no need for in the upcoming 1 or 2 years).

Main emails being sent are automated emails after a user has completed an aciton, or is is about to become inactive. Dynamic content is not currently utilizied, but is definitely going to be in the near future.

Currently we use a homegrown CRM that we are also considering moving away from.

What ESPs do you recommend for those interested mainly in dynamically generated emails, and mostly automated drip campaigns?