Ok, some of the Hik cameras do have a memory card slot but you still need to get power to them.
I spent a bit more and went for 4 x 4MP cameras with a 4 Channel NVR with 4 Poe ports. I bought directly from one of the Hik UK Distributors (a favour from a buddy).
The 4 channel Poe means I only run a single cat5 to each camera.
My advice would be buy the best you can afford. Make sure there is decent built in IR illumination (30 m) and check the lens. 2.8mm should give over 90 degree viewing angle but 2.4 will be much more narrow. Be careful.
Listen to Bignum's recommendations and follow his advice. He really does know what he is on about!