Which Bike for South America ?
This is going to sound stupid, so I'll get it over with. The Honda CG125. My home base is UK but I spend a lot of time in Brazil too. I've ridden both Armstrong MT500 and HD MT350 many miles, plus Transalp etc. I now use a CG and 06 Bonneville. The MT's are tough but unknown in South America. Honda's factory in Manaus supplies the continent with the CG, the Falcon 250 and 400, but your budget rules the last two out. The lowly CG can be repaired anywhere in South America. You won't need to pack more than basic spares or tools. You can carry up to 50kg's of personal kit/spare fuel, cruise at 80kph and go a long way on very little fuel. If you drop it, you can pick it up easily. Just pack accordingly and manage your fuel. The CG reels the horizon in just as capably as something big and shiny.