nikon d90 is like 20% more expensive than the k200d, if ur budget allowed, you may get the d90. the d90 is surely a better camera compared to the k200d (they are not even at the same level), but i think it, the d90, is a bit too fancy for beginners. so i decide to get the k200d. i just bought one 2 weeks ago and i am very happy with it.
Well, I'm not really a beginner anymore, more intermediate I'd say... I always shoot in full manual. So my biggest concern is that the K200D would be to basic and that I'd grow out of it quickly.