I recommend the Honda EU3000is and have someone install the Pinellas Products remote start and auto choke. Mine works great and will easily start my 15k a/c (and even easier now that I have installed the Microair Easy Start).Mine is installed on a rack on the back.
The twin Hondas are great as I have them as well but you don't want to be lugging them around or pulling on ropes to start them.
Honda makes the de facto standard that the others try to keep up with.
If you look at the larger Champions (3100-3400 Watts) you will see that they are way cheaper than the Honda equivalent but you get smaller engines, smaller fuel tanks, and a gravity fed fuel pump so using a larger fuel tank is harder. On top of this the Champions rate their sound output at only 25% load vs the Honda which gives specs at both 1/4 and full load. You can't find the specs at full load because champion says they are "not available". BS..... They don't want you to see how much quieter the Honda really is.
For example: Honda EU3000is is rated 58dB at full load and 49dB at 1/4 load. The Champion 3100W is rated at 58dB at 1/4 load. The Honda at full load is as quiet as the Champion at full load. The Champion at 25% load will sound twice as loud as the Honda at full load if you are not familiar with decibels.
I paid $1850 for the Honda EU3000is and then another $359 for the Pinellas Products remote control kit and automatic choke.