I probably should have said that I was using a CRT. I did briefly connect the 1200 up to my LCD (which has a native resolution of 1680 x 1050) to see how that looked and granted, 1024 x 768 looked better than the other modes which seems odd given that they were all interpolated.
I forgot to take pictures.
Anyway, is it safe to say that the advantage of HighGFX is that it's 1024 x 768 which is a more common resolution?