Creating the Perfect Hacking Lab

I plan on creating the perfect hacking lab.

Any suggestions?

Thank you for replying.

Things I am going to do so far-

Microsoft Windows XP VM

Microsoft Windows Server 2003 VM

Microsoft Windows Vista VM

Microsoft Windows 7 VM

Microsoft Windows 8.1 VM

Metasploitable VM

Backtrack 5 R3 VM

Kali 2.0 VM

Kali Dual boot with Mac

-Creating clean templates for all VM and storing on hard drive