I don't think enough folks have said, "It depends what you want to do." and I strongly disagree with anyone who told you which one to get.
"Just charge batteries, watch TV, or do low wattage 110V stuff" makes 1000 watts ok.
"Run a microwave, hair drier or other moderate amperage 110V appliance" is more in the realm of a 2000 watt model.
"To run the air conditioner" get's very touchy....some folks are able to with a 2000 watt genny, but they are on the ragged edge and must watch what else they are doing. My AC promptly pops the breaker on our Honda 2000.
For AC, I would lean towards a 3000 watt model (or paired 2000 watt ones).
