I bought a CCTV system off ebay around 12 months ago a Flourean brand, records in HD1080/night vision/Wi-Fi system which has worked flawlessly.
you can have it wi-fi or hard wired, I have mine wi-fi and all four cameras work great.
cheap as chips too.
This system didn't come with an hard drive (they do sell them with hard drives) I put a 1TB hard drive in the recorder from an old desktop that had an old Win 7 OS on it.
You just select format on the on screen directions and the drive sets itself up. also comes with software where you can see what's going on online with your mobile phone anywhere you are.
