[darkpuppet]

yes, in fact, you can... you can set your router's NAT to provide DHCP to all machines, and put your one machine in with the static IP and gateway settings from your ISP for that one machine only.

Then you'll need to define a route in your router settings to grab that IP mask/IP and forward it to the gateway specified by your ISP.

And that should get your one computer running the static IP, and the rest running NAT via your router. Depending on your ISP/router, you may need to use one of your static IPs for the router.