I feel a little silly writing this because I personally haven't worn a watch for a long time. Not by choice but I just broke all the ones I had before and never had the opportunity to get a replacement. I'm really into fine pieces so my tastes are pretty high and I'm not going to just go to some mens watches 99 cent stores and buy the latest plastic digital. I like luxury!
With that said mens watches are an essential part of the masculine fashion. A good watch can make a guy look strong and very masculine. The right watch can give style and also a "clean cut"-ness to their image that is very attractive. So, in my experiences the watches I've found to work best are usually made out of metal to begin with. If you can afford a precious metal then go for it, otherwise get something clean looking regardless.
Some other rules regarding mens watches are that they have to fit your personality and also be fashionable. Don't get a humongous watch if your wrist is only 3 inches around! Also unless you're a competing athlete/bicyclist I tend to avoid plastic and digital watches as they scream cheapness. I like to have shiny metals, simple design and a slick, minimalist fashion in my mens watches.
