How many computers in each 'lab'? If I was you, I would cover windows 2000 pro, windows xp Pro, windows server 2003 and apache. Also, Linux/unix distros of course. What applications do you plan on running to do this? If not through applications, what vulnerabilities do you plan to exploit to do this?
I'm going to be giving a pretty in-depth network security course at the end of the month (5 days long). I would like to incorporate several "labs" so the student actually get a hands on feel for hacking. I have designed a few labs for cracking WEP/WPA; however, I would like to have a total of 5-10 labs.