To disagree with the above, the A1200 also has a much faster (comparatively) bus and chipset. If you're going to be using Workbench a lot, you'll appreciate the improved performance and higher color modes. It's no video card, but AGA is definitely faster than ECS. Also A1200 upgrades are very cheap and easy to find, compared to just about any other model.
Which ever model you get, I recommend looking at an Indivision (ECS or AGA mk2 are available new from AmigaKit), which will allow you to hook up modern LCD monitors & TV's.
Good luck!
