Bit over your budget range, but I can highly recommend this:
http://direct.asda.com/Swann-DVR4-12...paamt&istBid=t
Swann are known for quality CCTV systems. They're customer support is top notch too. Plus if you have a smartphone you can set it up for remote viewing (nice!). I paid £150 for the very same kit from ebuyer.co.uk.
At the end of the day you want a decent, reliable kit (I've read about some of those eBay specials shorting due to water ingress in the cameras and the recording being unreliable).