Wow a month ago I was in your exact shoes.
First I had a problem deciding between Canon and Pentax then deciding between the K200D and the KM.... here's what happened with me..
The KM is the newer camera however It is quite a bit smaller and lighter. It has a very friendly menu and control options and was designed for the user to use it with one hand if they chose to do so. In Canada the price of the KM is $599.00 with the 18-55mm kit lens.
The K200D has more to offer such as tougher build quality being completely weather sealed (if used with a sealed lens), better photo editing in the camera, a wonderful anti-dust system and of cource the top LCD display and the 11 point focus as Zein said compaired to the 5 point on the KM. The K200D in Canada is $699.00 w 18-55mm kit lens.
In my opinion, you need to hold each camera to see what feels right. I was really set on the KM until I held it. I have bigger hands so it felt like id be struggling with the buttons etc. Then holding the K200D it was heavier, and bigger grip. Plus for the extra $100 I got so much more in a camera. Im not telling you to buy the K200D but I am telling you that choosing a camera is like buying a car. You wont know until your in the drivers seat.
Welcome to the world of Pentax by the way and to Camera Labs forums.
Thank you so much for you reply, it's great to hear someone who has the same experience before. I think I'm more sure about which one I should get now.
but one question, why is that 11pt AF system still matter if we use full manual mode?? well, basically, i dont really understand what it does