If I was going to recommend a single piece of hardware for every person to have (who owns a computer system), it would have to be an uninterruptible power supply (UPS) or battery backup.
I don’t really care as far as the manufacturer goes (I have two APC devices in my basement office), but you should really plop down the $50 or so dollars on even the smallest one and hook up your computer and monitor at the very least.
If you are in an older house with poor wiring, it is maybe even more important.
Go out there and get one. There is going to be a time when you will be happy that you did.