I extend my agreement with Phat and Tom, as well.

One additional factor, is footbeds. You can take a fairly flimsy trail-runner, add something like SuperFeet and you have a very supportive shoe. If you use the footbed daily, then you are always "wearing the same shoe" from an internal experience standpoint--regardless of which pair you happen to have on.

If you will be doing that, your most effective and cheapest over the long haul is something like the Feathersprings I use.
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Human Resources Memo: Floggings will continue until morale improves.