wanted to add, when I looked at shoes, some definitely have better ventilation than others also, for me a real comfort factor in hot weather. Throw in sock differences (I am a big wool sock lover) and there can be quite a range of shoe comfort out there influenced by a bunch of diff factors. I too am careful with my money, but spent more on the shoes I really liked because as you said, comfort and quality is worth it, especially for body comfort in any outdoor activity.
again, good luck with your search.