You might consider the Gryphon Diablo integrated amp. There are two used ones now on Audiogon below your top price, and both have the right voltage for use in France. You may also be able to buy a used one within the European Common Market (Gryphon is designed and manufactured in Denmark). While the Amatis have a nominal impedance of 4 ohms, they dip down to 2.6 ohms, so you want an amplifier that is stable down to 2 ohms and that has enough power to drive the Amatis. I had a pair for seven years, and tried a number of amplifier=preamplifier combinations, both tubed and solid state. I didn't actually try the Gryphon with the Amatis, but have heard them in other systems. In my system, the best solid state amplifier that I used was the Accupahse A-50V, and the best tubed was the VAC Phi Beta integrated.