I'm considering a Dahua NVR5232. I don't need 32 channels but it sounds like I have to if I don't want to max out the box with a few high res cams. Could someone please explain why that is? I thought the limitation was the max recording bandwidth. The 8/16/32 all have the same specs. Realistically I'll run 3-4 5mp cams and hopefully another 5-7 2mp cams at 10+fps. Is this the box for me? Also I was wondering if I should go with the -8P version. I hear the fan is a lot louder and the ports tend to fail. I don't mind buying one more poe switch.