Buy a PAL unit, and send Agnus' pin41 to GND. There you go... an NSTC unit.
But euh.... I've got an NTSC 1200 here and I would exchange it *any day* for a PAL unit. Find me a working PAL unit, and I will give you my NTSC one. It's near mint, only slightly yellowing on the keys. I'm keeping my accel and ram though. I'm in Montreal so shipping wouldn't be a problem... lemme know. random_zak[at]hotmail[dot]com