EmpireTech has a range of recorders from the Lite Series (4CH/unit) for smaller uses, the Pro Series (optimal for mid-to-large projects) to the Ultra Series (256CH/unit) for expansive projects, plus cost-effective options.
empiretech01.com
Go with either the NVR16CH-16P-2AI or the NVR8CH-8P-2AI. They are powerful and have all the bells and whistles you will need. They are also POE which makes them incredibly easy to setup. I would go with Empire Tech for cameras and NVR. Incredible company and prices!