I can only answer your questions with generalities because almost everything will be relative to your specific situation. Could you buy a non-POE NVR and a POE switch? Absolutely, however, your happiness will depend heavily on the quality of NVR, POE switch, cables, and quality of cable termination. Is there an advantage to having POE included with the NVR? Absolutely, that's probably the main driving factor in having POE standard on most NVR's. Does it end up being an advantage to you? Again, that will depend heavily on how it fits your scenario.