If only use in the shara...
For only the shara you could continue with your etrex.. just pull it out of your tank bag, turn it on, pull out map check Lat & Long from teh gps and locate your self on map...
If your going to use it elsewhere .. then the 60Cx (dropping the s saves a few quid .. and looses the barometer and flux gate compass) would give you that memeory slot that takes a 2G byte card .. that is enough to take all of eastern europe city navigator .. very handy ..
I've crash tested a 60Cx (over 80 km/h in deep sand) .. cracked the screen in at least two places and it still worked for the next two weeks all the way home. Still worked then ..but the cracks were getting to me.
Maping for the shara is poor ..but morocco is coverd by a free map (not from garmin but works on garmin maping gpses). Smellybikers wonderlust map does the rest .. as good as you'll get at the moment .. I've seen a rough try for Tunesia (sp?) but might be better waiting for the next try ..
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S