First things first. Why is Swann so bad?
They are very naughty when it comes to specifications. They aren't alone in this, the whole industry is rife with misinformation. Take their quoted ranges for cameras. They suggest effective optical ranges way beyond the capability of their cameras and flower it up with words like Crystal Clear. Their supposed 25 meter cameras might have an effective optical range of 5 meters or less.
Resolution. They seem a little confused in terms of what is and isn't high resolution / definition. 960H is absolutely bog standard D1 resolution but widescreen with the extra pixels filling in the bit on the edge of the screen. 720P is not High definition, it's sort of half HD. I would suggest 1080P as being full HD.
Wide angle cameras. This is where they fall flat on their face. You can throw umpteen pixels at your CCTV system but if you then use wide angle cameras the pixels spread apart rapidly as you move away from the camera. This means little detail is captured as you move away form the camera and so it only has a short effective range. Ignore any claimed ranges particularly those quoted "at night" or "IR range". Effective optical range is a very different beast.
Typically you will need several different cameras around your property for it to be effective so any kit that uses identical fixed lens wide angle cameras is unlikely to do the job.
Here is a
Guide to CCTV cameras which explains more.
We look at properties over the internet whilst discussing through with the owner what they are hoping to achieve. From there we can suggest specific cameras and locations.
I've just priced up a typical HD 1080P 4 camera system comprising 4 channel DVR, 2TB AV grade hard drive, 2.8-12mm open dome camera, 2.8-12mm traditional camera, 6-22mm longer range camera, Open dome 3.6mm fixed wide angle camera (for an entrance door). Camera power supply, all the connectors to allow the use of customer sourced CAT5/6 cabling. That came to about £650 plus Vat with a bit of love thrown in on the price
A very different system to that found in somewhere like Maplins.
Please don't take that as a definitive list of what you would need, all systems are individual but it's a realistic guesstimate to gauge prices.
A final thought on IP cameras and PoE (power over Ethernet). We don't sell IP systems, we use high definition analogue. Our choice is HD-TVI. With PoE you can't necessarily choose how many pairs of wires are used to carry 12 volt power. With Analogue HD you can still use CAT5/6 cable and the connections are made via video baluns & DC plugs / sockets. To minimise voltage drop we suggest using 3 pairs or wires for 12 volt DC, 1 pair for video. Longer range outdoor IP cameras tend to be very expensive and can suffer voltage drop when powered using PoE.
Hope that all makes sense.
Henry