I currently use the D200 at work all the time, and I'll honestly tell ya, It is a treat to use the K10 after a day with the d200. I find all the controls on the D200 awkward, and just plain old stupid. Hold this while spinning that while pressing here... LOL. Not really that bad, but it is anoying.
As for the 30d, the ergonomics are horrible
. Plain and simple.
As for all the other bells and whistles... I haven't needed them yet, and a damn good portion of all my photos turn out just fine.
I do not get all excited when these new models come out.
I am still very happy with my K10. No complaints.
Doug