Originally posted by Deimos To be honest, and people here might kill me for this, but if you havent had a dslr before AND are relatively new to more advanced photography, I would actually suggest a Nikon d40, d60, d3100 as they offer superb in camera help and explanations which make understanding why you are choosing a setting over another much much easier. Except for the d3100 they are pretty inexpensive as well
I started out on a d60 which was great to learn on and very capable. I just got a k-r and while it is absolutely fantastic, I am still a bit bewildered by all the settings and modes on offer. And the in camera help is pretty much non-existant.
That said if its only gonna be k-x vs k-r and its your first. I'd go for the k-r the extra features like showing the af points for one will make it much easier to learn on
I know everyone has already killed you for this, but I'll state my opinion anyway. You make good points, from what I have seen, the D40 has a ton of help messages in camera almost like a manual built-in.
However, you will most certainly outgrow it, and getting into photography is about buying into a system: lenses, accessories, etc. Thus, I highly recommend choosing based on where you want to end up, and perusing a book like "Understanding Exposure", tutorials online, or photography friends to learn, all of which I'd rate as highly superior to the D40's in-camera help. Camera manuals aren't that big, anyway.