Sat Nav with contour level mapping

Giving my wife ideas for Christmas, I am looking for GPS for outdoor use. Any recommendations on purchase. Should have Ordnance Survey level mapping preferrably Europe wide. Have seen Garmin Oregon which has this criteria but contour interval is 100m, not ideal for Military use. This unit costs in region of £400 but I would only be willing to spend this amount if it conformed with usual 10metre contour interval normally associated with Army mapping.

Ideas greatfully received
Or you could buy a mio 168 handheld PDA off ebay for around 45 quid second hand and errm have a look on the internet and download memory map all the UK in 1:25000 works a treat and dead easy to use

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