Not seeing any responses, I decided to put in my two cents.
I'd google 'review' (of each brand). If you don't mind paying a little, try Consumer Reports.
Where I live, in a rural area, we are limited somewhat by what installers are familiar with.
I have a very nice Bryant that came with my house. But like any gas furnace that isn't stainless steel, the burners rust out.
I did some searching on reviews a year ago and left with the impression that you really do get what you pay for, so make lists by quality and then decide how much you want to pay.
Of course it sounds like you know all this already.
But I'll add that I read a very insightful discussion about how with the technology getting better all the time, the longest lasting/most expensive isn't always the best investment.
On the other hand, who wants their furnace to break down when needed most?
A conundrum. No easy answer.
I'd call 3 installers to give you their favorite brand and suggestions for model, and a quote.
Get details of their reasoning.
My house was converted from electric to propane, and even the insulated ductwork doesn't do a good job getting to the far rooms.
As far as what a given heat rating can handle depends on other factors beside square feet. Your climate, insulation, windows, number of stories, etc.
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