I'm designing a system for a large educational facility. The facility is a new building with up to date network and cable management systems. I plan on using exterior cams around the perimeter and interior cams for choke points for a total of around 40 cameras. The exterior should be able to withstand weather down to -35C and I'm trying to avoid large heated housings. Cams that come to mind are low wattage d/n cams like Bosch/Extreme cctv EX27 or EX14 with the interior consisting of small dome cams like Pelco IS90. Currently, I am at a crossroads between analog cams to DVRs and IP cams to NVRs or software. I've decided to use UTP cable for future migration to IP/megapixal cams as they become more mature and cost-effective as at the moment I'm leaning towards analog cams using baluns. Due to the vast nature of the facility, it's pretty much a necessity to run cables to 4 different locations and install DVRs and power supplies before connecting to the LAN for inside domain access via network. Of course, some type of CMS is a pretty good idea here to pull all the units into one useable desktop. I'd be interested in hearing any suggestions or comments as there are members of this forum who have had some very sensible ideas.