So I need a UPS for my computer. I'm not sure on what wattage UPS I need and what a good brand to buy. I was looking at Newegg and APC looks promising. My computer has an Antec 550 watt PSU. I looked up a similar model and it said the input was 8-4 amps! That means I need a minimum 960 watt UPS? That doesn't sound right. My monitor is a Dell 20" LCD.