I find Garmins to be the easiest to operate. They are actually designed for one-hand (lefty) use in the field. I bought a mid-range one a few years ago (by now it's probably obsolete compared to what's available) for $200 and some change.
I would suggest taking a look at Garmin versus Magellan in terms of actual operation. You may find that one fits your style better than the other.
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