There are some good reasons to carry a GPS and keep it on. I'm not sure what the Rino offers in terms of computer connection.
The trick is to get a GPS that can upload and download waypoints and tracks. For me, the track thing is a lot of fun - and essential - in exploring. Looking at tracks later on a topo map or Google Earth is nice - I can really see where I've been in relation to the topography or places of interested. Likewise - marking points of interest in the map and uploading them to the GPS so you can "go to" them is great. Ditto in just marking waypoints (saving a location) along the way that you want to remember later - I save every trip and have files back to when I started riding.
As to navigating using a map - Ken's is probably the coolest (he'll have to chime in with what he's got) in terms of a big screen. I have a Garmin GPSMAP 60CSx and despite the small screen, it's plenty usable for navigating - because you don't necessarily have to see a big map to do it. It's a matter of learning how to navigate using the "instruments" (the arrows, compass dials, the indicators that tell you where you are in relation to your desired route or destination) if you want, or you can just freestyle it and let the GPS always point to your destination regardless of roads curving etc.
Another great feature to use is "bread crumbs" - using your saved track to "backtrack". A couple of times I've been on big broad open areas (or that granite area we rode near Mossy Pond is another good example) where you aren't on a clearly indicated trail and zooming in on the display and following the line of tracks you laid down will get you back to where you wanted to be.
It's good if you carry it, but better if you know how to use it.
I found this in a couple of ways because it was out there riding but didn't have the manual, and heck if I could figure it out. Fellow users (e.g.; GrizzlyGuy) have turned me on to easier ways to do things (like make the saved track big enough to see on that small screen).