Originally Posted by
cuevélo
I think that in the Garmin Edge bike computer series, only the latest versions (540, 840, 1040) have the ability to show contour lines. I would recommend these over the handheld hiking/general purpose GPS units if you want to do downloads from RideWithGPS, since these can do those downloads over bluetooth with your phone, and don't require a computer or corded connection.
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No way to know with the E2, but on the 1040 I recall an ability to set a map theme to show contour lines. You can of course, install Open Topo maps if desired, bit of work, but free.