Since I want to protect my new imac as much as possible when it finally arrives, I've been researching APC backup systems. However, I've noticed that they typically don't have a very high joule rating for surge protection, typically in the neighborhood of 300 joules. I've also noticed that a dedicated surge protector with a joule rating anywhere between 2500 - 6000 can be had for $20 - $70. It would seem the UPS is great at protecting against power outages, but not so great at surges. Is it possible / advisable to plug the UPS into a good surge protector, or would this not work? If not, why?