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Which UPS to buy?

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Most all UPS units state their ratings as VAH (volt-amp-hours) This rating is mostly one for one to the wattage rating of the devices you connect to them. Example: A unit rated at 1,000 VAH will power a unit with a 1,000 watt rating for one hour. So for your case, with a 450 watt load, and a 1,000 VAH unit will run for about two hours. There are some very good units made by APC and Tripp-lite and are a bit expensive but are a commerical rating and used in small offices. All units need to be exercised on a monthly basis. The major failure will be in the batteries, most commonly the gel-cell type but easily replaced.