I admit it - despite two failed attempts to really like the Pentax 55-300 zoom, I was hunting again. I owned both DA and DAL versions at one point with my K-7. The DAL went a-swapping for a weather-sealed 50-200, and the DA left during the budget crisis that ultimately cost me the K-7 as well. Now I've retrenched with the k-x and find that the better high-ISO performance allows this long zoom to have a better chance to yield blur-free images.
I didn't need this lens badly, so I let a few deals slip away, primarily on the DAL (optically identical but with a few less bonus features). But at last I stumbled into an offer I dared not refuse - so a 'like new' DAL is on its way, and the Sigma 100-300 will move on to cheer up someone else. The 100-300 is a better lens than I had expected, but pulling back to 55mm is a great feature - and f/5.8 beats 6.7 for those hi-zoom lo-light images I persistently try to capture. At least I now have iso5000 available in a pinch!
I find it ironic that my two original favorite lenses are back in the stable. The DA16-45 really caught my eye when I migrated from Alpha gear, and teaming it with the 55-300 and a 50 prime seemed perfect. The K-7 led me in other directions (mostly weather-sealed ones) but the k-x has turned me around. Thankfully the wheeling and dealing was a draw financially, so I'm happy to be back with this pair.