^ what he said. Blue iris works great, High Def POE cameras are reasonable and work great.

I've had to extend my recording archive time to weeks because I didn't realize something had been taken until days after the event. Being stored on a PC allowed the space to keep more data.

I run mine on an older high end laptop, easier to find the space to put it.

I have 6 or 8 network jacks wired up in the attic. I can add/move a camera without much trouble if I decide to change what I want to watch. (aside from minor angle changes on the cameras themselves)