AmazingVideoMagnifiers.com is a website that helps you buy a CCTV.
They have an ecourse listing the questions you should ask before buying. They have a quick comparison of the features in some of the stationary and portable CCTVs. They have an online catalog of some of the myriad manufacturers.
It may not show State of the Art devices, but this is a good first step before making this expensive purchase.
For more Info: http://www.amazingvideomagnifiers.com/