VPN

Hello guys, I have a small problem with a pptp vpn connection in my home. In my house I have a wimax isp.
This provider requires me to establish a pptp vpn connection to release to me a public ip address. Moreover in my home i have in total 2 pc and 2 mac e one ps3. I need of share this connection for all devices. Now , i use a windows 2003 server , where i have two nic , in one is present link for the isp wimax where i instaured a pptp connection, and another nic is present my home network. Once instaured a pptp connection, i shared it on another nic that is a home network. To this point i use all devices with a connection internet! That's all is possible done with a m0n0wall system? i hate windows 2003 server! Can i configure m0n0wall like a vpn client? Once done this is possbile share the vpn connection for another nic ? thanks for your reply.