Home surveillance system custom build ideas?

Hello, im looking to build my own home surveillance system to act as a DVR with cameras. im looking to build it inside a normal midtower computer case. but I want all the cameras to be hooked directly to the computer and have a few terabytes of storage. some lists of ideas and/or builds you would like to share would be ideal.
 
Have you contacted NSA?

P.S.
Ignore my stu-pid attempt at humor, I couldn't resist with all the NSA news going around. I'm sure someone with actual experience will join in.
 
This should keep you busy for a while: http://videos.cctvcamerapros.com/support/

About 2 chipset generations ago, I saw a mobo with extra PCI busses, (for camera cards), designed for surveillance work. That's about all I remember. It didn't come up in a quick Google search.

"Terrabytes of storage"? How long are you planning to hold a grudge?
 
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