If you want just a basic video setup to keep an eye on your office or shop, consumer gear from big brands such as D-Link and Netgear is likely to do the trick for $50 to several hundred dollars. First, though, look for ease of use. If you need to integrate the gear with business systems for access control, alarm monitoring, or point-of-sale systems, you'd best call a professional and prepare to spend thousands.

Although newer surveillance systems use ethernet instead of older coaxial cables, some products offer wireless communications--but that option isn't ideal if your site has a poor signal. Verizon, for one, touts a SerComm IP camera that sends real-time footage via its .

If you're looking for a more complex system, the IP Camera Finder on news portal provides a search for dozens of specifications, including resolution, autofocus, and built-in analytics.

Not all consumer-grade cameras are strong enough to withstand wear and tear where you install them. In contrast, internal heaters and fans inside models from specialized vendors such as Axis prevent freezing and foggy lenses. Heavy-duty "captive" screws and sturdy metal housing prevent vandals, and software will detect (and send an alert) if the camera is jarred or covered up. Night-and-day cameras, including infrared ones, can keep constant watch.