Its cheaper than you think.
Go to Best Buy, get a Linksys or Dlink (or other) router specific for sharing a Broadband connection. This option requires that your connection goes from Cable/DSL to ethernet. Many new ISP's are using Cable/DSL to USB to make the installation easier. Like the others said it appears as a single IP to the ISP and you have your own private network on the other side. Some added benifits, Possible printer server built in, 100 Base-T switch hub, DHCP server to automatically assign IP's and other settings, even tha ability to autoswitch to modem if the Cable/DSL line goes down, all for between 90 and about 175 dollars. Technology like this used to be at leat a grand. I run it in my house and I can say the performance is pretty impressive. Keep in mind I don't think you can have multiple players to an online game through any of the solutions above since they all appear as a single IP to the network. Hope it works for you.
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