Sorry Poohbore, but the 2 posters above are DEAD WRONG.
Get a winder. The winder keeps everything running and lubricated. Yes, you will cause wear on the watch by having it run all the time, but that's normal. That's why you have it serviced. Watches are designed to run. Keep the main spring wound and the gears moving. Leaving a watch sitting 99% of the time will make for more expensive services in the future.
/Just the random musings from a guy who has been collecting for years and has a few M3's worth of watches on hand.