IT MSP Space-3 reps

I am one of 3 reps for a MSP, I am looking to implement a CRM for us and I am looking for the best solution based on the following.

-low to no cost per month -no contact limits -want AI/analytics to show quality of prospect -integration with mailchimp/constant contact and social media

-simple, the less clicks the better, we want to be able to import a list and go to town.

Thanks in advance