On Friday I finally made the decision - from the two cameras that left in choice, I bought Pentax K10D. And first experiences are quite positive. In fact I didn't find anything really disappointing during first weekend of usage. I only learned, that I should better check manual choices I've made in the past, because changing white balance at interior, going out and taking photos there does not really produce great pictures.
The camera feels really good in my hands and I was able to figure out most settings without reading manual, but I think now it is time to do so :-). Maybe it will help me to get even more out of it, especially in controlling manual modes.
I have to admit that most of photos were left to automatics and I just tried what I can do with it. Combined with trips to Kyoto, Nagoya Castle and Inuyama, it is no wonder that I took almost 1000 photos during weekend.
Thanks to everybody who helped me with their suggestions, it really helped me in the decision!