I'm looking for a ~1kW UPS for my computer setup, ideally under $500CDN. The Cyberpower-CP1500PFCLCD stands out as being the best value, but despite Cyberpower calling it a "Pure Sine Wave" this review says that it is "a modified triangular wave that CyberPower calls “Adaptive Sinewave”". Does anyone know how this compares? I don't want to have problems down the road by cheaping out on a UPS. The Opti-UPS Durable Series DS1500B will cost at least twice that but it uses a sine wave AND has double-conversion topology which should improve the quality of juice going into the PSU. The biggest downsides are that it is not nearly as efficient (91% vs 99% on the Cyberpower) and it is rather loud. Found another one PR1500LCD, this one is a little cheaper than the Opti-UPS. I can't find a review of it though. Mainly concerned about getting the UPS now because while watching TV today I flipped the light switch on the wall to turn off the light in the room and my TV goes black then turns on again right away. If I turned the light back on everything is normal, but when I turn the light off again the TV flickers black and back on. It happens every time.