Originally posted by BrianR What's wrong with the quality of the photos coming out of it? What lenses do you have for it? Does it still function properly? Not that I'd try to steer you away from a Pentax, but if what you have is perfectly operational, I'd want to make sure I'm spending money where it counts. At the very least, articulating the things you do or don't like about your d3000 might help others spend your money for you.
The k5 series is tough and terrific, but lacking some of the whiz-bang features of newer models. For what it's worth I have not been tempted by the newer Pentax models and I plan to run my k5iis into the ground (I'm not sure it feels the same about me, and suspect it would trade me in for a newer and more capable photographer if it could just figure out how to use the Marketplace).
The color capture (is there a proper term for this??) isn't true-to-life. I have to do more editing than I would like to do get the color correct, and in very bright or very dark situations, getting the exposure correct is finicky and isn't always fixable in editing. For nighttime shots (cityscape types things, usually) it's almost impossible to get a decent, clear shot, even with a tripod. I am using the kit 18-55mm lens 90% of the time, and the other 10% a 55-200mm I bought at the same time.
I'm not too particular about whiz-bang, to be honest, having been such a dedicated film photographer for so long. I care about photo quality and camera sturdiness/longevity, I have no interest in being able to use WiFi to send my pics from my camera to my phone instantaneously so I can post them all over my social media.