Implementation of CRM (Construction Online Store)

Hello, there! Web developer services are required. There is an online store, direction of building materials. You need to implement a CRM system (while the choice is on AmoCRM, you may have a more interesting solution). It is necessary: employee management + customers + telephony + if possible, make customer cards with detailed information about each and send periodic mailings through the social network. I need to:

1) Which CRM system is more suitable for these tasks in your opinion, in the format: a few options, which and why.

2) How long will it take approximately to implement + set up

(3) How much will it cost to complete the process with a detailed description of what and how much and how you will implement it.