Think of buying the amp in Europe. There are many nice integrateds from British and French companies that should fit your budget and that were built with 220 (actually 230 these days) Volts in mind. Avoid buying US gear in Europe becuase there is a ridiculous markup on any gear that crosses the Atlantic (it goes both ways, BTW). Look at brands like Creek, YBA, etc.
Or go hunt for used gear once you are in Belgium.
Or go hunt for used gear once you are in Belgium.