it's funny - actually get more ankle problems with boots than i do with trail runners. i credit it to pronation problems (similar sounding to oregonmouse's) and in boots I can't feel bad step until all my weight is on my foot. in trail runners, there's a little more feel, allowing me to make corrections before they're too late. i have a pair of nike's - i don't know the model as it's worn off, but have logged a couple hundred miles in them and love 'em. time to find something waterproof for fall/winter.