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We used to have Intel branded motherboards in the school where I used to work as a computer technician and they came with just the regular brass standoffs and screws securing the boards to the standoffs (which in turn were screwed into the case). There were never any 'micro-cracking' problems with any of these PCs and we had well over a hundred of various Intel branded boards (and over 200 in total).
Intel boards come with a decent warranty - how long are you expecting these boards to be in use for? I suspect most boards will be well out of date/in need of updating long before any physical or structural problems may develop. The main way to ensure you don't get cracking around the screw holes is to ensure the screws aren't overtightened.