What UPS for what PSU?

I am trying to figure out what UPS I need to purchase for my power supply (a Corsair 1000 watt http://www.newegg.com/Product/Product.aspx?Item=N82E16817139007)

I know it needs to be pure sine wave, but what I dont know is if it needs to output 1000watts. I won't even be close to using a full 1000 watts in my build, but as video cards keep dropping in price I may be in the future with quad sli.

The solution I am looking for is now, so any input the wise folks here can provide would be greatly appreciated.
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More about what
  1. ***I just ordered a watt meter to see exactly how much my system is pulling. So when that arrives, I will have more details.
  2. +1
    You size your UPS to the actual draw of the computer (plus anything else you run off the battery).
    And it's OK if you don't size for a gaming workload either. Sure, the computer will shut down if you have a power outage while gaming. If you're major concern is work in progress that needs saving during a power outage you can size for that amount of power.

    Unless it's a 'mission critical' computer that needs to run for an extended time on battery power a pure sine wave UPS isn't actually required. Stepped sine wave is good for a home or office PC.
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