APC SmartUPS if you can afford it, APC Backup-Pro, or any of the Cyberpower (preferably Pure Sine) products. Another reason to get a SmartUPS is because APC PowerChute Business Edition software gives you a lot more options than the Personal Edition. I'm not sure about Cyberpower's management software.
Then SmartUPS and Pure Sine products use true sine when on battery power, not simulated like most consumer products. True sine is clean electricity and simulated sine is dirty electricity. But you can never know how clean the electricity is from your power company either. To me it's an iffy subject really. I mention sine because Active PFC is in current power supplies and they don't like simulated sine apparently. It's said to shorten the life of a power supply, I haven't heard it kill a PSU though. I personally think to kill your PSU overtime you'd have to lose power as soon as the battery is charged like daily for a year. I think you're battery might no survive either though.
I personally have a simulated sine APC Backup Pro 600watt/1000va and have not experienced any problems when pulling the plug. Everything works and stays up and I get 35-45 minutes of up-time. I have my server, router, and telephone router plugged into it.
Make sure to get a Kill-A-Watt or a Belkin Conserve Insight to measure wattage. I'm sure all you'll need is a 600watt/1000va UPS. It should get you more than 15 minutes of up-time.
That's just my
. Someone might have something better to say though.Edited by thenk83 - 2/25/13 at 9:10am