The people saying you should try UAE are probably right. Because many games will only run with specific hardware and roms and that's only a mouseclick away when using UAE. I for one can remember having to rip out the 512KB expation to play one game only to be forced to put it in to play the next. And having to re-kick it to run pre WB 1.3 games.
So if you buy hardware don't expect to be able to run anything that claims to run on A500, nor advertized as being non-aga.