Timex Expedition.
http://www.timex.ca/EXPEDITION-Chron...7C166.aspx?l=e
I've put this model of watch successfully through 7 years of a military career and it is still going (albeit i've changed the band twice but thats more due to velcro wearing out, you can get a plastic clasp band if you like). Retails for about 40$ at a walmart. Have suggested it to dozens of recruits, all of whom have been satisfied with it and have not managed to break it.
http://www.timex.ca/EXPEDITION-Chron...7C166.aspx?l=e
I use one of these now as a field watch, haven't had it for long but seems like a good, durable watch and has that "tactical" appeal.