sounds like ya got things nailed down, researched, and been there done that type of thing.
i am no help in department of what brand or specific model to get in higher ranges like you are wanting. but i would caution, about double checking local suppliers. some times they may sell enough, in order to keep some parts in stock. vs having to order certain things.
when just looking at different options a few years back...
some of the plus on some units were.... they would auto start and run for a little bit every so often (week, month). sometimes it was the panel on the gen, sometimes it was the "auto transfer switch" helping keep battery for starter charged up, while making sure engine would start.
some came with a battery minder / trickle charger, to deal with the battery
some came with "cold start" setups, some required add on package. ((core heaters, inline radiator hose heater pumps, oil pan heaters, etc...))
some generators, didn't have a descent, *duh* forget the term. load control, for when a well pump kicked on, or A/C kicked on. there would be a longer low power (brown out) type of situation. before generator started producing more electricity. some came with better "line conditioners for overall demand, some were better when full load others better at half load type of thing.
many times it didn't matter what manufacture you went with. due to amount of models differing from each manufacture.
double check on how loud they are (decibels) some come with a better insulated / sound proof encasement, while others. were just plain tin, that could start shaking, rattling.
double check to see if they need to be lifted off ground for enough ground clearance to drain oils, and other liquids from it easily. or if there are lower side panels you can remove, to access the drain ports.
some may have a more open bottom, allowing birds, mice, and other critters up into the enclosure, allowing them to build nests inside and around the motor and electronics.
double check to see if you need a screw driver to remove panels. or if there are thumb screws or latches you can undo, to double check things.
if water cooled engine. can you easily get into radiator and use air nozzle off the air compressor to clean it out? (dust, lawn clippings from mowing,etc...)