the 2 types of chips for cameras are CCD and CMOS. CMOS is the cheaper, read crappier, chip so if you want the best quality, make sure the camera is CCD.
You can pick up a pretty good color day/night low lux CCD bullet cam with infrared capability for 200 bux or so from a security wholesaler.
The recorder is the real meat and potoatos of the system. The archos is the best bang for the buck, but you could get away with a cheaper PVR for 150 or so that records to SD or compact flash.
Ebay will be your friend on this one.
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