Rich,
I do camera reviews as part of my job, hence the 30D trial. The 20D with give you the same image quality, and will save you a lot of money. The D200 has an excellent build and a higher resolution than the 20/30D’s but I have found the picture quality to be better on the Canon’s.
I am happy to give you more information, but we should continue such conversations on the photo forum. 🙂