I need to purchase a UPS for my server Rack. The UPs will be supplying power to three devices. 2 IBM x3550 at ~700 max watts. And one IBM ds3200 with two power supplies drawing ~500 watts each. My current UPS claims (via (w/1000) * 4560 hours = 3435.72 kWh) that I am drawing an average of ~ 800 watts. I'm looking at an APC SMT2200RM2U 2200 VA / 1980W and an APC SMT3000RM2U 3000 VA / 2700 W. Will the first UPS be sufficient or should I be looking at the second?