MailChimp / Mandrill integration with web-store (PrestaShop)

General information for the website: Online store on PrestaShop
Kind of development: Customization of existing website
Description of every page/module: We need to integrate an online store with MailChimp / Mandrill. Online store uses Prestashop, but back office and CRM were modified much so some standard solutions may not fit. Main purpose of integration is to set up triggers for the following events:
The customer / visitor:
Haven't bought for a long period of time
Made a purchase that is a little lower than bonus card sum (so we advice to make some additional purchase to get the card)
Visited specific pages
Registered
Made new order
Abandoned cart
Wrote a comment for our service
Asked to inform if the price for a specific item gets lower
Asked to inform if the absent item enters the warehouse
Made one's first purchase
Made one's second purchase
Made one's third, fourth etc. purchase
Chose some specific item (bonus) at a specific page
Received money for the internal account (buyer's virtual account in the store)
Moved for an upper level of progressive discount

Note that we need just integration so MailChimp (or Mandrill) should know the visitor's activities on the web-store. All the copyrighting, design and MailChimp automation we do ourselves.

Please:
1. Let us know what kind of information you need to give us the estimation
2. Describe your experience with MailChimp (and / or other email-services)

Thanks
Description of requirements/features: Main purpose of integration is to set up triggers for the following events:
The customer / visitor:
Haven't bought for a long period of time
Made a purchase that is a little lower than bonus card sum (so we advice to make some additional purchase to get the card)
Visited specific pages
Registered
Made new order
Abandoned cart
Wrote a comment for our service
Asked to inform if the price for a specific item gets lower
Asked to inform if the absent item enters the warehouse
Made one's first purchase
Made one's second purchase
Made one's third, fourth etc. purchase
Chose some specific item (bonus) at a specific page
Received money for the internal account (buyer's virtual account in the store)
Moved for an upper level of progressive discount

Note that we need just integration so MailChimp (or Mandrill) should know the visitor's activities on the web-store. All the copyrighting, design and MailChimp automation we do ourselves.
Payment methods: Credit Card, Paypal
Extra services needed: 3rd party integration
Specific technologies required: MailChimp, Mandrill
Extra notes: