>>>Thank you very much for a detailed and very helpful review. At Staples they have 450 VA /255 Watt and 900 VA/480 Watts APC models. The difference was about $30 dollars. So I will probably buy the "higher" model. Of course the hours they show on the box are quite optimistic. But if I could get 1-2 hours of time, that would be some help. Especially if my wife is watching a show on Netflix, I don't want to be the cause of interruption :)
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>>On the Staples site you should be able to get the exact model numbers. You can then use those on the APC site to get the runtime graphs and the battery model/quantity used in each. If the two models use the same battery, for your use there's no value in spending the extra $30.
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>Thank you for the suggestion. I didn't think that that would charge extra just for a bigger box :)

Pricing can be misleading: some Intel processors are from the same assembly line, but they spend additional effort making those CPUs draw less energy (by destroying some cores...) and then charge you less than for the energy guzzling CPU with more cores ;-))