Luminox, Seiko, Citizen, Casio, Timex, Wegner, St Moritz in no order of preference for solid performing dive watches. Most have models at the $100 mark that will do a fine job. You will find most people here are very happy with their watches. I personally own a St Moritz which I am very happy with. My wife uses a Wegner. Just make sure it's rated well. A lot of places say to 200 meters, but 100 meters should be fine. If you get one you really like, DO NOT send it to the local jeweler to get a new battery as most will not make sure the unit is properly sealed and therefore may or will flood. Most DIVE watches will need to go back to the manufacturer for a new battery. St Moritz will renew the warranty twice if you do this every two years. Seiko, St Moritz and I'm sure others have service centers for this purpose.