In my (J.E.B.) personal experiences, these are wonderful.
Power conditioner:
http://smartpowersystems.com/products/computer-grade-filters-tbf/pos-guardian/
UPS:
http://smartpowersystems.com/products/uninterruptible-power-supplies/
They can be a little tough to find, but persevere, it’s worth it. I learned about these seeing them protect registers at some large retail stores and other non-consumer situations where they really really don’t want things to get hit.
This is a personal recommendation by experience, I shall see no kickback for these words!