I just got my iMac back in November and now I'm looking for a UPS for it. I'm leaning towards going with APC since I already have one of their units in my home theater and I very pleased with it so far. My only question is if 650 VA is enough or if I should look with something with a higher rating? I really only have the 24in iMac, an external HD, cable modem and wireless router to worry about. I have a networked Brother printer also, but I heard that they draw a good deal of power when they kick on and thus, should not be plugged into the same UPS as the computer. This is fine with me and I have no problem plugging the printer into another outlet. I just want to protect the iMac from the occasionally power outages that I experience in my home, especially since I usually keep my iMac on in sleep mode most of the time. Also, I'll be glad to finally have some back up power for my cable modem since I have VOIP running through it. Thanks for any feedback.