Cctv system help needed

[SandyLyon]

You could use a Hikvision DS-7204HUHI-K1 Turbo HD (approx £110) 5MP Hikvision cameras (approx £50 each) and connect them with cat5e or cat6 cable and baluns.

Buy a 100m coil of UTP cable and a RJ45 crimping kit and make your own leads up, you can get HD baluns that have RJ45 sockets that convert to / from the video and power connections. So that the power and video are both carried on the same cable.
Add a HDD and power supply and you’ve got a very nice HD system
It’s worth spending a little bit more to get good quality, reliable kit.
As for the cat5e / cat6 cable, go for solid copper UTP not CCA (copper coated aluminium)

 

[motorbiking]

I'd focus on fewer cameras if the budget is tight. Wide angle, high res
hikvision ds-2cd2032-i might be better for frond door (£80 on ebay with 4mm lens) and maybe mount the second one inside e.g. Hikvision DS-2CD2142FWD-I (£130) with a 2.8mm lens
Have a look on ebay for an old synology DS21x (e.g. DS213 or newer) - they work forever and seem to go for £50-80 (empty) to £200 with a couple of HDD. You can get a new DS216J for £130 (j-meaning lower spec processor) - Couple of used 2TB disks..

then buy a TL-SG1008P £60 (gives you 4 POE points and 4 normal gigabit ports.

So worse case:
front door £80, lounge £130
Switch £60
Storage £200
£50 Cat6 and a handful of RJ45 ends, face plates and a tool etc.

I'm afraid to do Network based isn't cheap because you need face plates and back boxes to make it look nice.