This APC unit would meet your energy requirement.
The Sinewave seems to be an issue with most modern desktops power supplies with active power factor correction (active PFC). When this type of supply "senses" incoming power that is not using sinewave, it shuts down in order to protect components. I'm not sure if laptops have this issue, though if it's a concern of yours, this Cyberpower 1000va unit accommodates power supplies with this active PFC feature and is the same price as the one you're looking at:http://www.newegg.com/Product/Product.aspx?Item=N82E16842102132&cm_re=ups-_-42-102-132-_-Product
I use this 1000va unit on a desktop with such a power supply and it works great during testing. I also have the 1500va version for my souped-up gaming machine. That one works as expected as well. I've tested both by unplugging as well as through the included software which simulates the power loss. The software that comes with these UPSs allows you to configure the UPS to gracefully shutdown the PC after a certain amount of time. So if you're on the PC and you need to save a document or documents, you can do so and shut down manually, or if the PC is unattended, it will shut down gracefully after the set amount of time.