As fobotcso say's, the crossover option is the quickest, easiest and cheapest option.
I suggest you use Zone Alarm for your firewall, which has proven in tests to be more effective than Black Ice, and don't bother with Windows internet connection sharing, use this little program, (Proxy), which will share your internet access and e-mails effectively. And the best part; they are both free!!
http://www.zonelabs.com/
http://www.analogx.com/contents/download/network.htm