You're right, it was more or less those two IPC-HFW4231E-S vs IPC-HFW5231E-Z I was looking at, but it doesn't matter now with the feed back I have been given.
So I guess at this point I am going to be looking at getting 5 5231z or 5231ze depending on a price breaks 3 wall mounts and the NVR5216...