One thought I had about this was camera suitability. If you place the cams 25 feet away from your target, even with a narrow field of view, most cams that we use might make the target appear "too small". I suspect that the targetcam system you mentioned has some sort of zoom lens. Not sure, but it's something else you should check into. (Buy one cam and test it out to make sure it meets your needs.)
Here is an example of an adjustable zoom cam: http://www.ebay.com/itm/Mini-1000TVL-CMO...1655001961
(There are even cheaper ones on eBay - but something to consider.)
Here is an example of an adjustable zoom cam: http://www.ebay.com/itm/Mini-1000TVL-CMO...1655001961
(There are even cheaper ones on eBay - but something to consider.)