Originally posted by brofessor First of all, a K3 is a different animal than a KP. It is larger, uses a longer-lasting battery, has two card slots, probably not as good autofocus, but others may differ on this opinion. KP is newer, has better/newer - lower noise sensor, smaller, smaller buffer, lighter, has a newer autofocus system, flip-up screen, etc. Therefore, which camera is better depends on what you shoot and which features are more meaningful for you. If you like a bigger, slightly heavier camera, do not like adding a grip, shoot mostly posed people, travel, and landscapes often on a tripod, there is a strong case to be made for the K3. In deciding between KEH and B&H, I would choose KEH for their 180 warranty vs. 90 Day warranty with B&H. That said, I would do a shutter count - a good indication of actual use -as soon as the camera came in and would probably only keep the camera, if the count was less than 40-50K. Google this topic for more information. You could also order both and send one back after visual inspection, shutter count review, and an overall test of function - something I have done in the past myself. Lastly, I have seen KP sell for a little more than $500 on both Pentax forums and Ebay. Here is a link of actual shutter life results for the K3:
https://www.olegkikin.com/shutterlife/pentax_k_3.htm In any case, good luck...