My wife and I recently purchased a daycare and would like to upgrade the camera system. I have looked into several manufacturers including Lorex, Swann and Ubiquiti. I'm a network engineer by day, however I'm still pretty green when it comes to CCTV. 
  
Our requirements include: 
 
IP cameras 
At least 16 cameras 
Night vision 
3 outdoor cameras 
Audio would be nice, but not necessary
 
  
Any help from you folks much more experienced than I would be greatly appreciated. 
  
Thanks for your time!