If economy is an issue, I'd go with the traditional heavy leather hikers that Chris mentioned. The initial investment is a little high (these can be found used in decent shape although I don't know why, you couldn't pry mine off me), but the norwegian welt on these let them be resoled with new Vibram bottoms very inexpensively, and are crampon or other tool compatible with the lip they provide.

Some people also like to be inconspicous about their appearance, and avoid the "militant" look. I like the traditional heavy hikers because once they're broken in to your foot (seems like an eternity), they are really comfortable and super protective for your feet. If you protect the leather and treat it well, they will last a very long time. Seek the advice of a local shoe repair shop for care. Italy probably makes the best ones, expect to pay over $150 usually. If funding permits, a cheap pair of military or other boots that allow you to only wear the good boots on alternating days will really allow longevity. Nothing will last very long with day after day usage, they need a day to relax and dry out, so alternate them.
Good Luck,
Run