For indoor available light photography you need a fast prime: f2 or faster. Forget the zooms. I have the Pentax DA 16-45 and it is a good lens, but it is the wrong tool for indoor available light work. I usually use my FA 77mm f1.8 Limited, my SMCP-A 28mm f2, or my wife's SMC-F 50mm f1.7 (in that order), depending on the field of view I want. You might also consider the FA 35mm f2, the FA 43 Limited, the FA 50mm f1.4, the DA 70 Limited, or one of the many 50mm f1.4 or 1.7 lens available used. Lots of good choices in this category.
If you need flash, then an accessory hot shoe flash is vastly superior to the built-in flash. I consider the built-in flash as something for emergency use only. A decent hot shoe flash has 10X the power, allows bounce flash, use of a diffuser, etc. The results are
much better than the built-in flash.
Last edited by GaryML; 12-02-2006 at 11:28 AM.