Recommendations for a UPS?

Can anyone recommend an inexpensive UPS that would be suitable for the power load of a Mac Pro with 4 hard drives?
I was told by a salesman that I needed at least a 1500 watt UPS to support a Mac Pro, and the prices were about £200. They suggested and APC Back model 1500.
This seems excessive for a home user who just wants to be able to shut down the computer if there is a blackout.
I suppose that a feature that would automatically do a shut down in case I wasn't at the computer would be useful too.
Thanks for any advice.

A unit as small as 750VA would perhaps be okay. What really matters is how long do you want the system to stay up before shutting down? Personally, I would be looking at something in the 1000VA to 1500VA. I have an APC 1300VA unit at home that would be perfect for your system, and it was about $129USD. That UPS is on my home Windows box (I have a powerbook at home, and no Apple desktop) and powers an AMD 4800 machine (2.5GHz dual core AMD 64-bit chip, 4GB RAM, a 400GB drive, and a Samsung 216BW 21.6" LCD monitor). The unit estimates it's runtime for all that (with the machine near idle) at about an hour, so it is definite overkill for that system.
My work 8-core Mac Pro (2008, 2.8GHz model, 10GB RAM but only a single 1TB drive) Mac Pro and a Samsung 2693HM monitor (25.5" LCD) are on an APC 750VA SmartUPS, and the indicator lights show that the UPS is running at about 2/5ths of full load (ie. 2 of the five load level lights are lit). There are a number of good UPS units from APC, Belkin and others in the 700VA to 1500VA - anything in that range would be good, just depends on how much battery run time you would like.
An APC unit will come with a USB connection and cable. When you plug the USB in you will notice a new feature under the Energy Saver control panel. APC units will be fully recognized (make, model, capacity) as will a number of other major name brands (Belkin for one). You can tell OS X to shut the system down when the has been on battery for X-minutes, when it estimates the battery only has Y-minutes remaining runtime, or when the battery has reached Z-percent of full charge left. You can also have it restart automatically once main power is restored, or remain off until manually restarted.

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