Howdy...I recently picked up a Garmin GPSMAP 76S after doing 2 weeks of research on units, and it rocks! Large screen, loads of features, and an external antenna connector are what sold me, as well as the built-in maps. Offroute.com had a terrific price and part of the cost goes to support the site here...I go caching with someone who has a Magellan Meridian, and both units do a fine job of locating stuff and keeping satellite lock.
Like others stated, it's all about preference features you want, and whatever you upgrade to will work great
"You can freeze gum off of jeans?!"