[VinnyP]

If you are starting out with SLR photography then the lenses are going to make a big dent in your wallet. The 30D can be had a little cheaper so that might be a consideration. If it's not I will stick my neck out and say IMV the D200 is capable of better results, has more features and is more rugged and weatherproof than the lighter to carry 30D but the quality of pictures is far more dependent on the lenses and the way the camera handles.
As has been said both cameras are excellent and it will come down to personal preference as to which one you get. Trying them both will be the only way.