Question About Model Names / Numbers

[Ihmeyers]

I am looking to buy a used Devialet but I'm confused by model names/numbers.  I have seen reference in ads to

Model 200
D200
Devialet Expert 200
Model 200 Expert Pro
200 Expert Pro Core Infinity

From what I can find, it seems like the Pro are the current models but other than that there doesn't seem to be consistency in nomelcature, and I couldn't find model history on the Devialet website.

Thanks very much.

Ian
Florida, USA