Welcome!
May I recommend the Amiga 4000D(esktop)? You might find one costing no more than 150 Euros (tops!) with some expansion cards thrown in. This one is expandable with four expansion slots where the A1200 is limited to just one expansion slot (or you could consider towering one that is - a daunting task which has put me off).
On the other hand, A1200 are much more available and offer the same fun with the a/m limitations.
Happy tinkering!
