Since the Nikon D200 sells for close to $2,000, it is
probably not what you are looking for.
Most people who prefer either Nikon or Canon will concede that both Nikon and Canon make excellent cameras. That should put "mrobzob's" comments in perspective.
IMHO, Canon has the lead right now in the area of low light performance. This is particularly true in the price range you are looking at.