Bought the large Garmin dezl 760 because I like Garmin products over the others, but have not really used it yet.
Whatever you buy, get one with the lifetime maps. You don't really need to update them very often, but it's nice when needed. One of my older GPS', which would cost about $50 to upgrade the maps, doesn't show the new (5 years old?) cloverleaf on the highway, so it always shows that I'm out in the trees when I go home. When I go to Vancouver, WA every year, I always update that GPS because there's always new overpasses or exits down there.
Bill