3000 rpm is the sweet spot in my motor too, and is the 70 mph rpm. That seems to be typical of small 4-bangers from “Japanese” manufacturers… I use that term loosely because so many of these vehicles are designed and manufactured in the U.S. now.
I dramatically reduced wind and road noise in mine some years back. I gutted the interior and lined it with sound insulation (dynomat on the sheetmetal and special fiber matting in the cavities). I was expecting a reduction in noise from the car itself, but was truly surprised at the very noticeable reduction in noise from outside the car. Wind noise and noise from passing vehicles almost entirely disappeared. A lot more of that was penetrating the body than I realized. I did it for fun, but I learned a great deal.
However, unless the OP is as crazy as I am, that doesn’t help. He NEEDS to test drive the car. Nobody can tell him over the internet whether the car’s noise will bother him.