I may use the 50-200mm zoom and I'm sufficiently pleased with it but, if I were doing it again, I would have bought the K100D body, the DA 40, and the DA 21. That's it. I'd walk around with the DA 21 and use the DA 40 once in a while for beautiful landscape shots and amateur portraits.
If I were to only have the K100D and the DA 40mm with no additional lenses, I'm confident I could be delighted with the camera indefinitely. The best part of this setup is I can take 10 shots and get 10 great images. I have confidence in the system. Before, many of the shots came out pretty gross and I never knew if it was going to work out, or not.
Autofocus is lightning fast with the DA 40. The only time it had trouble focusing is when I was shooting straight into the sun at sunset.
I don't know when my batteries are going to run out but I'm at 10 days and 830 pictures on the current charge of a set of Energizer NiMH 2500 cells. The display shows fully charged right now at 20C and it showed half charge earlier when the camera was outdoors at -10C for a while. How long can the thing go on a charge?
Every one of the pictures above is a JPEG straight out of the camera. The first one is a half resolution crop (but it's just as crisp at full resolution). The rest are scaled to 1/4 resolution. None were sharpened, noise reduced, or processed in any way besides sizing them and re-saving them to JPEG.
This has been an extremely worthwhile exercise. I really appreciate the expertise and willingness to help within this group. I'd like to pass along a heart felt thank you.