I have a client that is installing a T1 line and needs a Firewall/Router. What is the difference between and broadband firewall/router by LinkSys or 3Com and the least expensive firewall from Cisco such as the Cisco PIX 501. The office in question has 10 internal only users and an eCommerce connection to the store front provider for access to the accounting system. They also want VPN capability in the future.