I'm currently working my way through school at a local community college for Information Security, and most likely Information Systems. It's only two or three extra classes to nail that down. My current cert I'm working on is Network +, thanks to my school offering classes that include the cert as part of the class. I want to start going more in depth, and since I'm switching to a new job soon which features a 4 day work week, I'll have more time to lab stuff out. But, I'm stuck right now as to what I need to have for a good home lab. I have an assortment of PC's (three desktops, two laptops) and a 4 port wireless router that's now full. Of the desktops, I've got one running Windows 7, one running Vista, and one running Linux Mint currently (that may change now that my MSDN AA subscription from school got activated). This is all located in the office area of the house, which is fortunately a room that my wife does not care what I do with, server rack included

. And granted, I'll have aquire things a peice or two at a time, to stay within budget. So, what should I start looking for?