Mountain Biking - What about mavic xl or sl without disk!! any recommendations?

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I am upgrading the rims from my giant nrs and needs lighter and more aerodynamic rims. what about mavic xl or sl without disk? any recomendations? I use this bike mostly on the road, but the road in malta is like offroad in many places..... give me some suggestions thanks :)
Maybe these, they are extremely light, and have the option of either rim brake or disc brake, plus they are alot cheaper than a mavic or spinergy wheelset.
http://www.notubes.com/product_info.php/cPath/42_44/products_id/134
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