Here's what I have:
http://www.newegg.com/Product/Product.aspx?Item=N82E16842102070
One of the wisest purchases I've ever made. CyberPower makes very affordable UPS units. Just make sure you pick the product that has the wattage capacity you need.
Skippy, I use the APC Back-UPS XS 1500, and just replaced the batterys in it.
It's an older model however they still sell the 1500's and it will keep 2 comps, 2 monitors, and the cable modem on for like 2 hours++ with no outside power.
I hope this helps you decide.
Dbad
What are you running in your computers? I can't get more than 23 minutes with a 24" monitor, 1 computer, modem, switch, router/firewall, and a fan (cools down the network stuff).