Above all, you want to implement the cheapest crm system available. you are willing to accept any risks associated with this, so you would want to implement a(n) crm system.
mobile
open-source
social
on-premise

Open-source

Explanation:

 Open source CRM system is the phase that are associated with the customer relationship management (CRM) solution. This open source CRM system uses the program by which the source code are available in the public to use for modify the real design.

The main advantage of open source system that it is implemented in the cheapest cost and accepts all the risks that are associate with the CRM system.