Easiest way to narrow that field boils down to ,,,
Do you want electric start, or pull start?
Honda and Yammy build the best units, and the most expensive, but they are all manual/pull start until you get into the $2000 price range.
Champion and a few others build units in the 3000 to 4500 watt range that are either electric start or remote start, at about half the cost of the premium brands.
In any case you will need to look for a unit rated for at least 2800 and likely 3000 watts for reliable AC coverage, especially if you are going into higher elevations.