I was total newbie earlier this year (still am compared to most of you
But....why buy a nikon, canon or anything else...with the k-x you are getting about the most feature packed camera for the money. In body stabilization is a big deal with prime lenses. Pentax also feels the most comfortable to me also.
Also, I have to say, buying a dslr is a slippery slope. I bought the k-x in feb. 2 months later I bought the da 55-300 and then a month later I bought the da 40 limited. You will want to buy lenses, so why not pick a brand and stick with it. I do have to say, for the money a k-x/da40 limited combo is *really* impressive!!! So small and great quality!!
The k-x is just fine for a beginner camera.....buy a good book like "understanding exposure" look at youtube videos and most importantly look through all the threads in this site. I cannot emphasize enough how helpful this site has been in helping me understand the basics of photography.
So here is how I see it. Just take pics with your camera (even if it is auto). Do the heavy learning on websites such as this...people are really nice on this site.
Buy the k-x (instead of k-r) and then use the extra money and buy a da 40 limited..you will never look back!
just my two cents.....