Autoresponder CRM System

I need a fairly robust autoresponder CRM system. It needs to have a contact manager, broadcast email, follow up email campaign capability (a series of emails that are sent with a determined number of days between messages), create customizable webpages with webforms built in that put people into follow up campaigns. We need something almost EXACTLY the same as this software here: [login to view URL] You can watch a demo here: [login to view URL] It doesn't have to have it's own email service, we can use a similar one to the one that allclients uses like sendgrid or amazon email service. Please also login and take a free trial so you know exactly what we're looking for as far as functionality. I can't describe it all here since it is so robust a system. I want to hire someone who has experience building CRM systems in the past. It needs to be very robust and stable supporting potentially hundreds of users and thousands of contacts stored for each user.