You can start small with MailChimp. Consider their pricing - https://mailchimp.com/pricing/ You could run an experiment with the Free plan from MailChimp. You can work with upto 2,000 contacts synch'd from Sage CRM to MailChimp within a single audience. And this allows you to send 10,000 emails a month.
The company I work at is currently utilizing Sage CRM. They want to integrate with Mailchimp. Is this worth doing? I figure it better to start small before scaling to any kind of marketing automation tool like Hubspot. I would love to get everyone's thoughts on this.