I’ve got a Hikvision kit from https://www.cctvkits.co.uk and I can’t fault it. Fairly easy to setup, chose a large hard drive which gives me about three weeks recording with 4 HD cameras. I have an app on my phone so that from anywhere in the world I can see a live stream from each camera.
The cameras I bought all have night vision which isn’t bad, not sure you would be able to use them in court to identify a burglar unless they were up close but in daytime mode you would. It’s more about spotting something wrong and being able to act on it. On that note you can configure triggers that send emails when the camera picks something up but I have the basic cameras and this functionality is basic (and rubbish). Essentially you draw an area in the camera’s field of vision which you want to trigger an alarm if someone walks into it. The more expensive cameras intelligently detect movement and trigger the alarm whereas mine simply look for a change in the pixels. After half an hour setting up trigger areas I found I was inundated with trigger emails because the sun was in and out of clouds and the shadows were being interpreted as pixel changes and thus an intruder. I mention it because if this is important for you please get the more expensive cameras or a PIR sensor to add to the system.
Anyway, very happy with the Hikvision kit, good admin interface, easy setup, good quality recording, remote viewing and fairly cheap, think I paid about £300 all in including four cameras.