Originally posted by JohnBee K200D is better build quality.
- Pentax K-mount(not crippled)
- optical and digital DOF preview
I think your list has a few other slight inaccuracies mentioned by others, but I want to focus on these, becauise there is more to it thn meets the eye, I think. As far as I know, *both* K200D and K-x are "crippled" in precisely the same way - camera cannot read aperture ring and therefore must use stop down metering. The K-x does have both optical and digital preview, and the optical preview does work to stop down and display a meter reading with manual lenses, and it also provides a one-button way to momentarily stop down and set shutter speed. So they are functionally equal here as far as I can tell. But I've read the K-x always flips the mirror up when stopping the lens down for metering - true? If so, that would be kind of a drag (although nowhere near as much so as the K-m not having a live meter reading via optical DOF preivew at all), as I use these operations pretty often and wouldn't want all that mirror slapping every time I meter.
Overall though, I'd say the K200D and K-x each have advantages and disadvantages. Saying one clearly trumps the other would overly simplistic no matter which one you were to claim was superior.
Note we are talking here about the K200D, not the K2000. I would agree the K-x does beat the K2000 in virtually every possible way. But between the K200D and K-x, it's more complicated.