I've never needed a GPS and have eschewed them thus far (expensive, one more freakin' thing to carry, have to learn how to use them), but someday in some situation I'm sure I'll wish that I had one.
$85 shipped from Amazon. IMO it's all that's needed. The mapping and color screen on higher models are superfluous for someone like you who understands landnav. The etrex H gives you the high sensitivity receiver for fast, accurate coordinates and the ability to follow tracks, routes and waypoints. Simple and effective. Use lithium cells.