One more piece of advice, forget the CCTV cameras, you won't be able to get a good enough resolution on the face. Go with high definition right off so you don't waist your money on the low res stuff.
Something like this...
Lorex 4-Channel, 4-Camera Indoor/Outdoor High-Definition NVR Security System Black LNR1141TC4 - Best Buy
Or even better... 4MP system but they get pricey.