Is my current UPS sufficient? or should I get something with a higher VA rating? I don't necessarily need to be running EVERYTHING should the power go out.. (like, I'd never have both the PS3 and my computer on at the same time, since the TV is used for both).
I really just need something that could regulate the voltage when these or some combination therein are running.
A good way to see your draw for this would be to use a Kill-a-watt. You can get one on the internet or many Home Depot or Lowes hardware stores. Measure while you are gaming and take an average + 20% for electronic component degradation.
Answer : Yes
The wattage of the UPS is how much its AVR can output, not what its battery can support. If you exceed the UPS wattage .. well some units can tolerate a small overload, some shutdown, some go into bypass, and others burn out.
You probably should not use the UPS with this system, its not donig much good anyways as with your load you'd be lucky to get 45 seconds runtime; Plus your Cosair PSU probably has an AVR built in.