As said above, once you get out of civilisation Garmin's own maps will probably not be very useful any more, nor will they be affordable. But you can get free maps from OSM. They are also not perfect, but they are getting better all the time and if you find roads that are not on the map then please contribute your track logs, because that's how they come to be.
I think what you mean by GPS v. SatNav is this: by your definition a GPS is a box that displays your latitude and longitude, whereas a satnav is a GPS with a map that routes you. These days we call them all GPS. There is no reason any more to not buy a GPS that doesn't display a colour map and does auto-routing and if you want to use free maps then your choice is almost limited to Garmin at this point.
I use a GPSMap 60CSx and I'm reasonably happy with it. I only wish for a bigger screen and a power button that lasts.
If you are interested in the Zumo range there is a dedicated site. If I remember correctly some people there prefer the 660 over the older 550, but go and have a read. It's not cheap.
You still need paper maps for the big picture, but I found that cheap tourist handouts often do the job.
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