Maciek, no surprise that I say: buy a gen.
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Ever since I look at watches, the Sub has been my goal.
Now that I have it, it will probably be the last I sell.
But 4.400$ is a bit to high in my opinion.
Why don't you try the r-l-x.de sales? It's a great place for you as not far away, so no taxes.
Forget the US: you'll pay taxes anyway and I'm not sure the sellers are as "serious" as on the German forum.
Anyway, get a genuine, if the watch is your fav or one of your fav...for all the others, stick to frankens
EDIT: Us sellers maybe less serious with overseas buyers I mean. After all, once the watch is gone...