The Rhino w/radio isn't bad, but even more expensive than the 60CSx, which has the best/most accurate satellite tracking. Bear in mind, that despite the number of buttons on the 60CSx, you can at least operate them with gloves on (a surveyor's tip is to glue a rubber pencil eraser on your glove's pinky finger). Touch screens only work with bare skin, although just yesterday I came across a news item on conductive thread that you could sew into a glove. Nonetheless, the reception on the newer (and also more expensive units) like the Oregon and Colorado is just not as good.
I have custom programmed my 60CSx with topo maps I created in ArcMap and MapWel. This isn't something someone without GIS experience could do but at least with the Garmins it's possible. Nothing like being able to quickly flip on a township and range layer to show someone either that you are in the right place or they are in the wrong place! Also, I've added custom features like certain meadows I want to approach carefully.