Take PowerHungry's advice, invest in a good UPS. Power constantly fluctuates; sometimes it spikes, sometimes it sags. Certain areas are worse than others. A good UPS not only provides a battery backup if there is a system failure, but it conditions the power that is going into your system, and that will keep even "flaky" PS's stable. Surge suppressors don't condition the current going into your system, they have a resistor that breaks connection after voltage reaches a certain level. Some work, some don't. But there is a 10 to 25 volt variable that they allow to pass. Trust me, I lived in Europe for 14 years running power through transformers and I could actually see the lights dimming and brightening throughout the day, but the UPS kept everything stable. I now live in an house built in 1908 and the power lines are completely erratic. If I hadn't learned early on to use a good UPS, I would have lost many boards and power supplies. It's a damn good investment for anyone. (I recommend APC Backups Pro 420 or higher).
Soyo KT400 Dragon Ultra Platinum
2100+ T-Bred B @ whatever