how would the Oregon, Montana or eTrek models be better suited than the 62s? I'm totally new to these and honestly don't know what features I would need or don't need. It be great if they are already programed or I could buy the program but I doubt that could happen.
I assume breadcrums is the function that the GPS actually follows your path and will store it as a trail/road/etc.
Well from my experience the features I would want to have in a GPS all in one unit would be:
-track back (records a track like the bread crumbs and allows you to retrace it) probably one of the more important ones
-the ability to set a poi (point of interest) and navigate to it which is where it's nice to have both road and topo maps as sometimes you can't just follow terrain directly in a Jeep and that's where it's hard to find one that will do it in the same map/menu. This is where you either have two different software sets or two GPS's to cover this.
-next is topo maps and satellite view. 24k topo shows more detailed maps of elevation change and is usually region specific because it takes more data. Thus you have to buy each region you want and it's probably easiest to have each on an SD card so you can carry it. I would recommend getting a GPS preinsatalled with the 100K topo for the US as it shows the entire US and while it isn't as detaile it's a general 'map' that still covers a lot then just buy the 24k topo for the area you're in a lot. The sat imagery (and the topo to some extent) give you the ability to navigate and determine your location visually via land marks and terrain changes.
-for driving, it's more difficult to use units that aren't touch screen such as the 62 and etrex because it takes a while to scroll through and type letters (especially with the road maps if your typing in a location to search or whatever) touch screen just makes this easier.
-another important factor is the antenna. The 62 probably has the best antenna for hand held units out there and this matters if youre ever in heavily wooded areas, canyons, river bottoms or where there's a lot of overhead cover and a signal is difficult to get and maintain.
-battery life is another major consideration. If you have it on all day you want it to be able to last a while without having to change or carry 10 sets of batteries especially on extended trips. Touch screen units generally have a lesser battery life due to the screen size and design however some are getting pretty good.
-lastly is just whatever other bells and whistles the unit comes with (magnetic compass, barometer, camera, geocashing stuff, etc etc.)
It's hard to find units that will do it all. My biggest want is a unit that can do both navigation like the on road where you type in a location/road/city/poi etc and it will show a route, combined with topo maps which also records a track and does back tracks and a good user interface all in one menu and in one unit. I've yet to find exactly what I want. All that being said. IMO the 62st is probably the unit that has the most of what I want (I'd like to look at the Montana more as I don't know much about I and it's supposed to be one of their best units yet) but the 62st has 100k topo preinstalled, has the good antenna, pretty good user interface (minus the ease of the touch screen) you can add the 24k topo for your area and the road software and you have a very capable unit. Sorry for rambling on and on but there is so much to consider when buying GPS's that it's overwhelming and what I've said is by no means the end all be all perfect solution, just what I've seen from my experience. That's also why in an earlier post I recommended 2 units...while it is a bit of a pain to switch back and fourth, a road GPS will be touch screen and actually should show more dirt roads than you might think. They can be had pretty cheap and can mount on the dash so you can glance down and get a general idea of where youre at when you're driving. Then if you have a unit like the 62st you have the topo and backtrack to navigate when you slow down or stop and need to make a decision on direction or determine exact location or whatever else. Again that's just my opinion and since I have yet to find exactly what I want all in one unit, I've found that's what's worked pretty well. Hope this helps and sorry again for the really long post