Originally posted by Tada Can anyone recommend all around good lens kit for my K-5? I currently have basic 18-55mm Lens kit. But, I want to have a better single lens that I can take it to Italy with good indoor (Museum/Architecture/sight-seeing) capabilities.
I will more than happily do a trip to Italy with only the kit lens for the given purpose.
Having said that, here are some thoughts.
You might want to look at a faster (wider aperture) standard zoom for indoors usage. See e.g.
DA* 16-50mm vs. Sigma and Tamron 17-50mm F2.8 Comparison - Introduction - PentaxForums.com which compares a couple of kit lens replacements. I think it's a better option than the DA35/2.4 for your requirement (single lens), usage and (assumed) experience.
If you come from a P&S, don't go for a prime lens (single focal length) as the only lens; you might get very frustrated if you're not used to its limitations. A DA35/2.4 will be a good addition to the kit lens, but defeats the purpose of a single lens solution and is less flexible (only fast at one focal length) which might be limiting indoors in a crowded museum.
Search for posts started by tony3d and the keyword italy; he used the DA18-135 on his recent trip to Italy and my understanding is that he was more than happy with its results; he did post photos so you can judge yourself. I'm not sure if he took indoors museum shots with it and I don't know how it performs.
Food for thoughts, I think.
Lastly, when you buy a lens, don't wait till the last moment. Buy it, test if it's OK and get used to it; nothing more frustrating than finding out on a trip that it does not work properly.
Enjoy your Pentax and your trip.