JAF Inox is a Brazilian company that was recently purchased by Duyvis-Wiener, as Sebastian pointed out.
One of the things that this has done is to increase the price of the machines significantly, at least outside of Brazil - the other thing it has done is extended the delivery times as well.
There are many ways to produce chocolate in the 300-500kg per day range you mention. There are big differences in price as well as the amount of integration (materials handling) that is and can be done. So, Sebastian is right - we need to know more about what you want to do, the equipment you are looking at, and your budget, to be able to offer more informed opinions.
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clay - http://www.thechocolatelife.com/clay/