I second the A500. DrH. mentioned 'affordable' . For an 18-year old working part-time, it was 'barely affordable' , but what a blast it was!!
Number 2: Yes, NewTek, the Toaster, Lightwave, and everything. Newtek at least kept Amiga in the limelight for a bit longer, and certainly helped create some interesting hardware (PAR card comes to mind)