Get it opened, and drying out as soon as possiable......water can damage your movement (i.e. circurt, coil ) faster than damaging your dial or hands (although that can get damaged too, it just takes longer)......the quote you got from Tourneau was most likely a "full service" quote that basicly (and I assume that your Coach is quartz/battery)...chunking the old movement and putting in another...(thats what they useualy do instead of repairing the existing movement).....water damage is not covered by your warranty also, they can pressure test your seals on your watch to see if they failed, or that the crown was left open......most of the time the seals are fine and your screwed.......just a little heads up for ya.....