I also reccomend the Freestyle brand. Most of their watches are good to 200 m and they have a lot of diver styles to choose from, and they are inexpensive. I paid $40 for my first watch and I think my latest was around $50. The customer service is outstanding too. I lost the bezel off one watch and they sent me a brand new watch when I mailed it to them for repair.
Freestyle - The Official Site. Freestyle watches. Surf, Skate, Snow, and Wake
Freestyle - The Official Site. Freestyle watches. Surf, Skate, Snow, and Wake