Timing is everything when upgrading from an old camera to another that's not as old. I upgraded K10D to K20D when K-7 was still on the store shelves and I wasn't prepared to pay the going rate of then about 1K dollars. I stumbled upon a fellow who wanted the video feature of K-x badly enough that he was willing to part with the K20D at a price that I couldn't resist. I didn't plan for this upgrade but having done so, I think I did the right thing. K-7 do not offer enough improvement over the K20D to justify it as an upgrade. It's almost like K20DSuper.
One time, I had thought to play with every flagship model, albeit firmly marching two steps behind the current model but I am going to bypass the K-7 and upgrade to a K-5 after it's replacement arrives and establishes itself. I'll end up marching just one step behind but hey, that's an upgrade in itself!