Your creature comforts may be worth lots of sats... mine are not, so i would say that Freezer and Fridge are the only "need" items in that list given that food can spoil quickly.

You can boil water and cook with a propane cooktop & propane never goes bad... $1000 will get you a VERY long way.

Now you need what... 2 hours of backup for your fridge and freezer? or maybe it's a whole day?

If your power is going out for more than a day on any type of regular schedule, I would begin looking for a new home or getting a diesel generator instead.

Batteries are not suitable for electric heating devices.