[GEli]

While not completely useless, the dust removal system in any camera is of limited use. In the K200Ds case I believe the dust removal system involves using the image stabilization mechanism to shake the sensor vigorously for a short period of time, ideally shaking off all the dust on the sensor at the same time. While it's a great preventative measure (I have my K10D set to shake on every startup), dust will occasionally still get stuck on the sensor and require a blower to remove. I really don't think the dust removal system should be a high importance item on your pros and cons list.

In fact, don't give the bodies all the attention. You're buying into a system where you'll be upgrading the body every few years anyways, so it's really the lense lineup that you should be going over with a fine toothcomb. Pick the system with the lenses that you'll be using both now and those you'll upgrade to in the future. The differences between the D80 and the K200D are really small compared to the differences in the price and quality of the lenses both systems are compatible with.