Hi Chasecam,
Definitely dump the Arlos.
I would narrow it down to the following 3 options imho.
(1)
If you want to go for the Costco route I would go with this instead ( looks like the same NVR ):
Costco Wholesale
And then augment it with 2x Dahua OEM starlights from Andy.
More info on that kit here:
FYI - Some local Costco B&M have a Lorex / Dahua OEM 4K 6x camera kit and 8 port NVR for $800
If you can afford it:
(2) I picked up a NVR5216-16P-4KS2 and the Dahua OEM starlight cameras ( HDW5231xx ) and it works well.
(3) Others here really like the
Blue Iris on a used windows i5/i7 PC + external PoE switch.
Note - all the cameras mentioned above will work with Blue Iris - so if you want to upgrade to BI later you can do so fairly easily.