If I was buying a generator now, I would look seriously at the HF Predator Inverter series.
Basically a Honda knockoff as I understand. Fairly lightweight, quiet, reliable, and puts out sine wave power.
They have had a lot of favorable review from owners.
The price reflects this popularity however.
3500 Watt Super Quiet Inverter Generator
www.harborfreight.com
Here is a diesel for grins, per the previous comments.
$5000 and you need a forklift or a crane to move it. And it has less output than my Northern Tools gasser.
518 lbs, no wheels.
It is liquid cooled, so quieter at 66 dB.
Not sure if they made a mistake on fuel consumption rate. At half load it will run .45 hours/tank, which seems wrong. Maybe they meant .45 days per tank.
KUBOTA-GL7000 Kubota GL7000 7kW Diesel Generator - available at AcmeTools.com. See KUBOTA-GL7000 plus more KUBOTA at Acme Tools.
www.acmetools.com
You can see it has a big battery on it.