Not sure what answer you expected, asking that question on a Pentax forum.
The Ricoh purchase has been widely heralded as a very good thing. It provides Pentax with a parent company that has capital, marketing and business skills Pentax badly needed. The previous owner (Hoya) made many bad decisions, IMHO, that hurt. Ricoh has made no secret in their announcements that they want to take Pentax to a new level and compete with the big brands.
I do not think you can go wrong with any of the brands today, all of them make cameras that are better than most photographers. Making the limiting factor the photographer, not the camera. More important than the camera is the lenses you have and your skills. The differentiation with cameras is more with ergonomics right now, I think. Which camera fits you hand better. Pentax DSLR are smaller than most and some folks with big hands may find them too small. But if I have to carry a camera all day, small is very good.
And if you are buying used, which I assume you are with the K7, then what are you worried about? If you do not like it, sell it back. If you buy right you might even make a profit.
As noted above the K-mount has a huge history of good glass and you can get some real gems for very little money compared to other brands. And you do not have to worry about whether it fits.