I've been using FS-UAE for ages now. It's probably the simplest of the bunch to get up and running. Most of the all time greats as far as games go came out for either the A500 or the A1200. Not much of a point in bothering with other machines commodore made at the time. You'll need the kickstart roms (aka Amiga BIOS). Unfortunately, mapping controllers can be a massive pain, especially if your controller doesn't work out of the box so it might be something to look out for.