ParisMatt, those 2 last little details make a HUGE difference regarding your original question.
There are several logistical problems that need to be resolved before shipping a pair of working AL-IIIs overseas, the least of which is that they are relatively fragile to move and NEED proper support, so you are looking at either finding a pair that has the original factory packaging or get some custom fitted (probably wooden) shipping cases made for them. Another possibility would be th have the "wing" assemblies removed from the bass cabinets and shipped in a separate box from these, then re-assembled when they arrive (probably a safer bet). So, as far as shipping alone goes, $500 is close to ballpark, give or take a few hundred $. I'm also thinking that a pair of Amazing Silvers could even be easier to ship only requiring the rmoval of the bases to pack into the original packaging or to get custom crates made.
Unless you find a pair with the original factory boxes, figure on as much for custom fitted wooden shipping crates which will at least double the total shipping weight which in turn raises your shipping costs.
It might actually be worth looking into finding a pair in Europe (I doubt that more than a few dozens pairs exist over there), preferable locally and find someone you know and trust to transport them for you.
If you want ot stay within the Carver family of products, there might be another alternative you could consider. A pair of Sunfire CRM-2s or CRM-3s with a properly matched sub might be just the ticket. As they are available new adn they weigh substantially less and are much smaller, the difference in shipping costs alone might pay for the slightly higher price.
One thing you haven't mentionned is the size of your listening room and just how much available space you can devote to the speakers. IMO, your typical Parisian appartment wouldn't allow you the 1M side and rear clearance and 2M distance between the speakers to allow a pair of AL-IIIs or Silvers to develop their full sound potential.
As for your choice of a TFM-42 or 45, it should be a good starting point for any of the 3 sets of speakers mentionned above.
Hope this helps.
Why let facts or common sense get in the way of your opinions.