Ordered the Pi computer, power supply and a new USB 3 Drive as recommended. Waiting on the case to be delivered.
All went ok, including migration from data on USB2 external drive.
Couple of tips.
Clean up your recordings if you are migrating, the copy can take a long time from old to new drive.
Do not assume that you have the updated firmware on your Pi computer, just because you bought it recently. Take the time to load it via the micro SD drive. Without the firmware upgrade, you get 4 flashing green lights on the Pi.
After your install is complete, go to the actual IP address. That is where you can manage your recordings.