hi, I was in the excat same boat as you and finally got my 1200 a few years back and let me tell you it was worth it!
I would highly recommend getting at least an 030 card (preferrably Blizzard as its rock solid)..my Blizzard 030@50 lets me run lightwave 3.5, doom, barsn pipes and many kickass aga demos with no problems at all
..of course, as many here will tell you, once you get a 1200 you will feel compelled to do many upgrades such as: 4GB or> CF card as main DH0, get a Indivision AGA crad to use modern LCD or VGA monitors etc etc etc :-)
anyhow start with the 1200 and 030 and go from there and have fun!