Well, here in Baghdad I have a pair of Wolverines in a smooth neutral suede with 200 grams of Thinsulate insulation. The sole is softer than vibram but thicker than what is on the combat boots. They do not have a steel toe. I cover on average about 5 to 7 miles a day in them on all kinds of terrain, carrying 40 lbs of body armor. I added an orthopedic heel insert to them only to cushion the impact, which seems to be working well. The insulation seems to help keep my feet cooler I guess. I waterproofed them and I clean them once a month. They cost me about $60 as I recall, and they've held up pretty well. One day I did 12 miles in them, and my feet weren't complaining as bad as other parts of me were. These are lighter than my elk hunting boots, and I would use them for hunting upland game in moderate terrain, but not up in the hills, they do not have enough support for that I think. I doubt you are going to push as hard as that for moderate load backpacking, so these type boots should be suitable. They have only two seams, so they should still meet your criteria. They are a great hot weather boot.
It's been my experience that what people put on their feet is a very personal choice. I've shucked top of the line boots for something that fit my foot and my style more appropriately.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)