I went through this myself recently - but they still make the Foretrex. They just hid it really well on their website. I thought they quit making it too but I just bought one last December.https://buy.garmin.com/en-US/US/prod30025.htmlhttps://buy.garmin.com/en-US/US/prod30026.html
What they don't make anymore is the version that had a sealed internal battery. Everything takes AAAs. I put dielectric grease on the battery contacts and a flexible non-permanant gasket goo on the battery door. It makes for a mess to maintain but it kept water out through a steeplechase and a rather windy Florida 300.
The wireless data transfer on the 401 is nice too...I can send routes from my handheld to the 401 without any cables.