Didja happen to come here from DP, or is there more than one "dave4shmups"?
This may sound odd - but you *want* a pal miggy, most games work best off a PAL system, This does essentially mean having a tv that runs PAL (In the US, rare) or getting a commodore monitor. Even a 1702 can take a PAL A/V in and run it no problem. Of course a true amiga monitor will look better.
And yes, you want a 1200. You really want to do a 1200.