Your questions are simple...the answers...not so much!
1) Try not to pay much attention to spec's, since manufacturers often inflate spec's to a meaningless point. Look for cameras with good DSP chipset solutions; PIXIM, Sony Super Had II or Effio, Eyenix Mona Lisa, etc.
2) Look for features you may want like; 1 TB+ of hard drive storage, DVD burner (?), recording in at least D1 (720 X 480 pixels) resolution (maybe 960H...960 X 480) at 30fps on all channels, remote viewing on smartphones, etc.
3) Is a Porshe better than a Toyota? If you don't need IP Megapixel cam's & just want something that will do the job reasonably well, you may want to stick with DVR (analog).
4) Technically yes, since NVR's can work with multi-megapixel cameras. IP is great, but unless you are comfortable working in the IP world, you may want to stick with analog DVR's
5) We don't use analog in corporate security anymore, but some of the cheaper new ones I've seen, (Dahua, Revo) seem pretty good. Some of the cheap ones (ZModo, Night Owl, Digital Watchdog) seem pretty God-awful to me, (IMO)... check some out in person before you buy... also, definitely look on these forums on how good tech support is. The last thing you want is to install your system & not have a way to make it work.
Good luck in your search!
Thank you very much for that information man " title="Applause" /> have a good one.
