Okay, time for some real-life info on UPS's. I found this out myself in the long run. Get the biggest VA rating that you can afford!
My Custom-built System:
19" Sony Monitor
Case includes:
400W Antec P/S
1.33 AMD Athlon
Radeon 8500 videocard
(2) 7200 Maxtor HD
(1) Yamaha CDRW
(1) Pioneer DVD
(1) SB Soundcard
(1) 10/100 network card.
My UPS is the CyberPower 725SL (725VA/400W). I only get 9 minutes runtime with just my monitor and computer plugged into it. And this was just when the computer was at idleing, doing NOTHING. The box for my UPS says 20-65 minutes for a "normal workstation". So don't go by what the box tells you. Also, if I leave the power switches on, on my computer and monitor, my UPS will not work! It won't allow the devices to turn on, because there is too much power drain. I have to manually turn on both my monitor and computer, AFTER I turn on the UPS.
I doubt this 350VA will even allow a computer to run 1 minute. Maybe LCD users and people with PII/Celeron/AMD K6 may be in luck. Make sure you can return it if it doesn't work out for you. If you take a look at UPS's in the stores, you will note that they are all becoming bigger, and increasing in VA. They are discontinuing these lower VA models, because they don't have enough power to keep a current computer up and running. You want a UPS that at least gives you 1-2 minutes to shut down the system.