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I have an APC LCD 1300VA Backup UPS connected to my computer system. Yes. Over kill but it was "on sale" - at 50% off. Bought it the same price as a 650VA unit.
If you can last a while, do keep an eye out for "on sale" 800+ VA units (usually 4 times per year). Then, decide which UPS model is most affordable. And, use saved dollars for different computer add-on - like an external HD - for critical data backups using included Time Machine.
As stated above, Backup UPS units are great for "graceful" auto shutdowns and for filling in the "brown out" electric dips - that many surge protection bars cannot do.
Hope this helps...
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