Amcrest or EmpireTech

You will be her techie so get something you use - for 4 cameras find a 4th gen from a county auction for like $25 and go to town.

But if you go the amcrest NVR route, yes you can add any Dahua OEM to it, just keep in mind the NVR is a budget NVR and will likely require lower bitrates and maybe other compromises.
Yea for sure.. i tried to talk her into spending more but things are tight money wise. Im not sure of any county auctions around me either. Eventually i will have some extra cash and gift her one of Andys 4mp with a 1/1.8 sensor for her to look over her car. Thanks for the help and advice!!