Lab setup for security learning

[ankurjn113 () hotmail com]

Hello all
Me and a couple of friends wish to set up a lab of our own for learning network security. I'd like some suggestions 
about the setup of the lab with respect to 

a) The number of machines (We only have 3)
b) Networking components (we have a 4 port switch and a 4-port hub)
c) OS/Softwares (Win XP, Fedora Core 2, Backtrack (for all testing), windows disassemblers etc.)
d) Setup architecture (both physical and software)

Any suggestions for above are welcome. I'd appreciate it if you can provide any links/docs/tutorials etc. 

Thanks
Ankur

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