I'm building a network of 24 systems. I got a D-Link swich which works perferctly. The Internet connection is dynamic IP bussines-class cable. I need a good router or HD firewall to put between the modem and swich so I can create a private IP range. Can you recommend any such router. Make/Model pls? I only need 1 port for the network but I wouldn't mind 4 port.