What kind of uninterruptible power supply do you use and why?

I was wondering what kind of UPS you guys use and how effective are they in terms of minutes/hours and what kind of features do they have. I figure a good UPS is one of the most important hardware pieces a good desktop can have. A power outage can eat those hard drives up...you know what I'm talking about :cry: I personally use a Power Walker VI 2000 LCD 12000watt, it has a cool usb cable...