640 Adv
Dunes are fun indeed, they call for HP at the wheel, lightweight and water-cooling. In the desert you need to inflate/deflate tires and need to carry a small compressor or air pump, water and some tools as well, so you need basic carrying capacity.
For the budget you have you can find a good second hand 640 Adv and still have money for installing Michelin Desert or Dunlop 908RR tires, heavy duty tubes and new chain and sprockets before entering the country. It's a no brainer for me, that bike is hard to beat in the desert, including for playing on dunes. Other japanese bikes either lack HP, or are just so heavy that you'll hate yourself digging it out of sand.
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