I am very satisfied with K7 performance, well above the Kx (focus accuracy, ergonomy)
Never put it under rain or extreme conditions
One bad thing - the sensor broke after 10000 clicks (dark band on the left of all images) so I sent it out for warranty repairs 1 month ago. They moved fairly fast (received it on the 7th of September, ordered the parts from manufacturer and now status is "on repair') Maybe they'll put the new Exmor sensor on it
Anyway I preordered a D7000 so I can compare and if the Nikon (body and primes) deliver on my expectations, I think my Pentax will appear on the marketplace along with the kit lens and FA31.