I am thinking about upgrading my Garmin Forerunner from 305 to 405. Here is a link for the Garmin Forerunner 405 : http://www8.garmin.com/ces/forerunner/index.html
In the last few weeks, the Garmin 305 has been giving me trouble. At www.REI.com, they are having a sale for the 405 from May 1st to May 10th.
The Forerunner has helped my running. It is one of the best running items. If you can afford one, I suggest you to get at least a 305.