Spec me a web server

[badcompany]

I need a VERY cheap web server unit just for my own developing and to run some IP cameras off it.

do I need to to build pc or can I get hard disc with web server built in?

 

[badcompany]

I was thinking along the lines of an atom based system

I have a a couple 2.5 and 3.5 drives kicking about and a gb of so-dimm ram out of an old netbook.