Ola from North Carolina. My K-10d has been to Ireland, Alaska, Germany, British Tortola, and lots of other places in the us. My K-10 does everthing I want it to do. I started out on the marketplace looking for the best walk-around lens. Any suggetions?
It depends a lot on your needs. Do you need a very wide zoom range or not?
If the answer is yes, try the Sigma 18-125mm or 18-200mm, or the now discontinued Pentax 18-250mm.
If you don't need such a wide zoom range and are looking for more wide angle than tele possibilities, the DA 17-70mm F/4 and DA 16-45mm F/4 are both worth a look: the former is better overall but more expensive, while the later is very affordable and still a decent performer.
The upcoming DA 18-135mm WR might be worth it too, especially considering it's a good match for the weather sealed K10D.