I have to vote for the A500. It was the cheapest of all Amiga models, so it really brought Amiga to the masses. And it didn`t even sacrifice much expandability. When you got an A590 and a KCS-PC emulator you where as powerful as a reasonably expanded A2000. Furthermore, when the A500 was introduced, it`s technologoy was still ahead of virtually any generic machine on the market. Later models like the A3000 and the A1200 didn`t seem as superior to the newest (and most expensive) sound cards and graphics adapters.