"Are there true NTSC-based Amigas out there? (Besides the A1000)?"
All if not most of the Amigas sold in Canada and the USA were NTSC machines. If you wanted to play Pal games you had to force it to do so in the boot menu. (for example a Video Toaster that was made only for the NTSC Amigas will not even run on a pal machine) You have to remember that true Pal is 50 Hz not 60 and NTSC is 60 Hz you are thinking of the frames per seconds in NTSC its 29.97 Pal draws more lines on the screen but slower at 50 times per second then NTSC so whan you play a pal game on a true NTSC Amiga you usualy cut off a small portion of the screen on the bottum and it will run at a different speed because the refresh rate is faster (60 times per second but less lines to draw).
