All of the anwers here are correct. As a sales manager with 3 years experience I also recommend you to go with Hubspot + Sidekick solution.

I am also a founder of CEO of inbound marketing and Hubsport partner certified agency Incredo

We have 3 SAAS venture backed clients which use also Hubspot + Sidekick solution for leads nurturing and sales tracking.

Call me for strategic consultation and set up guidance