Have a look at IP cameras, I got a good quality 2 camera setup running for £200 (ebay sourced, no dedicated recorder though). You'll need a PC/NVR to record and some networking kit to make it work.
Quality wise the picture is much better than my friends Swann Pro 700tvl system (approx 4x the resolution, much sharper and less noise at night) Build wise they have been running since Jan and have never dropped out.
I went for IP cameras after looking into Analog and was told theres no point getting good resolution cameras (6-700tvl) and getting a DVR that cant make use of it.
DVRs record in CIF, 4CIF(VGA) or D1 resolutions to make use of 700tvl resolution you need to be able to record all channels in use at D1/4CIF resolution. These are known as "full D1" recorders adn gernerally cost much more.
In my case, the IP solution was working out cheaper (i had a spare PC and a network switch (8 port~£15)) and giving 4x the resolution. Easily scalable too if i want to add more. They come with their own recording software (upto 1600*1200px per channel) and can be viewed on my phone or can log in and view/edit them from any web connection.