3 Remote Sites need connecting……

Currently I have 3 remote sites that need to be connected to our main site. We are looking at using 56k Frame Relay lines to connect them. I am wondering if anyone has suggestions on what equipment to use and suggestions for configuration. I would like to find a way to have one router at the main site that can handle the 3 connections coming in. I was thinking of sticking with Cisco but any suggestions would be much appreciated.

Thank you in advance for your help.
Joe Blaylock